Government Regulation No. 291 / 2015 Coll.
Government regulations on health protection against non-ionising radiation
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Effective from 18.11.2015
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18.11.2015
03.11.2015
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291
GOVERNMENT REGULATION
of 5 October 2015
on the protection of health against non-ionising radiation
The Government mandates, pursuant to Article 108 (3) of Act No. 258 / 2000 Coll., on the Protection of Public Health and on the Amendment of Certain Related Laws, as amended by Act No. 274 / 2001 Coll., Act No. 274 / 2003 Coll., Act No. 392 / 2005 Coll., Act No. 222 / 2006 Coll., Act No. 110 / 2007 Coll., Act No. 151 / 2011 Coll. and Act No. 223 / 2013 Coll., (hereinafter "Act on the Protection of Public Health and Health at Work") to implement § 35 (2) and § 36 of the Act on the Protection of Public Health and Health Protection at Work Act No. 309 / 2006 Coll., as amended by Act No. 362 / 2007 Coll., and Act No. 189 / 2008 Coll., "The Law on the Protection of Public Health Protection and on the Protection of Health at Work and Protection of Other Health at Work and Health at Work, and on the Provision of Health at Work and Services of the Act No. 26 / 2006.
Subject matter
This Regulation implements the relevant provisions of the European Union1) and provides for
(a) non-ionising radiation limits (hereinafter referred to as "maximum permitted values") in the frequency range from 0 Hz to 1,7.1015 Hz for workers and individuals in the communal environment, the method of detection, exposure assessment, the minimum range of occupational health information and the minimum range of measures to protect the health of workers;
(b) conditions for technical documentation of lasers, security of operation and operation;
(c) an indication of the places where the exposure of an employee and a natural person in a communal environment exceeding the maximum permissible values in the frequency range from 0 Hz to 1,7.1015 Hz cannot be excluded by warning.
Exemptions from the subject matter of the adjustment
(1) This Regulation shall not apply to patients exposed to non-ionising radiation in the frequency range from 0 Hz to 1,7.1015 Hz when providing health services.
(2) This Regulation shall not apply to consumers who are knowingly and voluntarily exposed to non-ionising radiation exceeding the maximum permissible values in the frequency range from 0 Hz to 1,7.1015 Hz when using special body care devices.
(3) This Regulation shall not apply to the risk associated with long-term thermal stress of an organism associated with exposure to uncoherent infrared radiation in the frequency range from 3.1011 Hz to 1014 Hz and to the risk associated with the contact of conductors under voltage exceeding the safe contact voltage.
Definition of terms
For the purposes of this Regulation:
(a) non-ionising radiation static electrical and magnetic and time variable electrical, magnetic and electromagnetic fields and electromagnetic radiation from artificial sources with frequencies of 0 Hz to 1,7.1015 Hz;
(b) optical radiation from artificial radiation in the frequency range from 3.1011 Hz to 1.7.1015 Hz corresponding to wavelength from 180 nm to 1 mm;
(c) coherent radiation from optical radiation resulting from stimulated emissions where its phase and frequency are clearly defined; radiation emitted by laser is radiation coherent;
(d) non-coherent radiation from optical radiation resulting from spontaneous emission of radiation;
(e) by laser, any device which may be adapted to produce or amplify electromagnetic radiation in the optical wave range by a process of controlled stimulated emissions;
(f) the maximum permitted values of the limit value which are based directly on proven health effects and biological activity data and which do not exceed which ensures that workers and natural persons in the communal environment exposed to non-ionising radiation are protected against all known direct biophysical and indirect effects;
(g) the reference values of the directly measurable parameters of non-ionising radiation in the frequency range from 0 Hz to 3.1011 Hz, which are electrical fields, magnetic induction, radiant flow density and contact current, which are used for easier demonstration of not exceeding the maximum permissible values.
Method for detecting exposure
(1) The detection of exposure to non-ionising radiation shall be performed by calculating or measuring the modified intensity of the electrical field induced in the body of the exposed person, the specific absorbed power in the body of the exposed person, the density of the radiant flow and spectral radiance, the intensity of the electric field, the magnetic induction or the contact current.
(2) Failure to exceed the reference value ensures that the maximum permitted values are not exceeded. Where a comparison of the calculated or measured values of the relevant quantities indicates that the reference values are exceeded, calculation or measurement shall demonstrate that the maximum permitted values are not exceeded.
(3) When comparing the exposure of an employee and a natural person in a communal environment with the highest permissible values or reference values, the uncertainty caused by the inaccuracy of the calculation, the approximation of the theoretical model or the inaccuracy of the measurements used by the apparatus and the conditions of measurement shall be calculated by:
(a) the mean relative error of the calculation or measurement of the relevant value of less than 1 dB or 12,5% for field intensities and 25% for power quantities, the maximum permissible value or reference value shall be considered not to be exceeded if the calculated or measured value is equal to or below the maximum permissible value or reference value;
(b) the mean relative error of the value to be collected greater than 1 dB, the maximum permissible value or reference value shall be deemed to be not exceeded if the calculated or measured value of the relevant value is lower than its maximum permissible value or the reference value reduced by as many decibels as the decibels exceed the mean relative error of 1 dB.
(4) The maximum permissible values and reference values are set out in Annexes 1 to 3 to this Regulation.
Exposure assessment
(1) In addition, when assessing employee and natural person exposure to non-ionising radiation in the frequency range 0 Hz to 1,7.1015 Hz in a communal environment outside the maximum permissible values and reference values, account shall be taken in particular of:
(a) direct biophysical effects,
(b) radiation intensity, frequency spectrum, duration and type of exposure;
(c) exposure to fields and radiation with different frequencies and exposure to multiple sources of non-ionising radiation;
(d) the information provided by the manufacturer of the non-ionising radiation device, including the inclusion of lasers in the class within the scope of the requirements of the relevant technical standard; and
(e) indirect biophysical effects such as:
1. interference of electronic devices and devices, including pacemaker and other electronic medical devices;
2. risks associated with the extinction of ferro-magnetic objects by the action of a static magnetic field with magnetic induction exceeding 3 mT;
3. the risk of ignition of electrically operated detonators;
4. fires and explosions resulting from the ignition of flammable materials by optical radiation, sparks caused by contact currents or abrupt discharges;
5. the risks associated with the interaction between optical radiation and photosensitisers; or
6. risks associated with temporary glare optical radiation.
(2) The assessment of the exposure of an employee to non-ionising radiation shall further take into account:
(a) any effects on the health and safety of workers at specific risk, in particular those with implanted electronic medical devices and pregnant workers; and
(b) information obtained by a provider of occupational medical services in regular supervision at workplaces to identify and evaluate risk factors.
Minimum extent of measures to protect the health of workers at work with non-ionising radiation
(1) Where exposure assessment indicates that an employee is exposed or may be exposed to non-ionising radiation exceeding the maximum permitted values, at least one of the following measures shall be taken to protect his health:
(a) ensure the organisation of the work, the working procedure and the organisation of the workplace in such a way as to reduce the worker's exposure to the electromagnetic field below the maximum permissible value;
(b) to provide personal protective equipment where they are available for a given type of non-ionising radiation which reduces exposure to the electromagnetic field below the maximum permitted values.
(2) Classes 3B and 4 lasers are equipped with light or acoustic signals. The light-signalling shall be adjusted so that it is already in operation when the power supply is connected. The colour of the signal light shall be selected in such a way that the light is visible through the protective glasses.
(3) Lasers classified in Classes 3B and 4 shall be protected against the entry into service of an unauthorised natural person. The spaces intended for their operation shall be marked with laser radiation safety marks and a ban on the entry of unauthorised natural persons. All objects on which an uncontrolled mirror reflection of the beam could occur shall be removed from the beam's path and the beam shall end with a matte target with a small reflection factor. If it is not possible to ensure the operation of the beam in such a way that it does not affect the glass in the windows, the windows shall be covered with material that does not release the radiation of the wavelength used. In the case of impulse lasers, it shall be ensured that when the power supply is switched off, the accumulated energy is discharged into the load.
Minimum range of information provided by workers to protect health at work
The employer shall provide information on:
(a) the maximum permissible values, the method of detection and the possible risks resulting from their overrun;
(b) direct and indirect effects on health;
(c) how to recognise and report harmful effects to health;
(d) the working procedures adopted,
(e) measures taken to protect health at work; and
(f) the correct use of personal protective equipment.
Content of technical documentation on data necessary for health protection in the treatment of lasers
Each laser shall be accompanied by the following technical documentation:
(a) the wavelength of laser radiation and the type of laser active environment; If they are lasers emitting radiation with more wavelength, all radiated wavelength shall be reported;
(b) laser radiation generation mode; whether it is continuous, impulse or impulse with high repetition frequency,
(c) the diameter of the beam at the laser output and its pitch; in the case of a collecting bundle, also its smallest diameter,
(d) for lasers generating radiation
1. in continuous mode, the greatest radiant flow,
2. in impulse mode radiant energy in one pulse, the longest and shortest duration of one pulse, the largest and smallest repetitive pulse frequency; or
3. in impulse mode with high repetitive frequency data as in point 2 and the largest mean radiant flux,
(e) the classification of laser into class within the scope of the requirements of the relevant Czech technical standard;
(f) operating instructions, maintenance instructions and, if necessary, important warnings, such as a prohibition on the detection of a housing cover for lasers equipped with a housing or hazard warning resulting from the observation of a beam by optical aids;
(g) the serial number of the laser and the year of its manufacture, the business name or the name and address of the manufacturer, if any, if any, or the name, surname or business name and place of business of the manufacturer,
(h) data on factors other than radiation arising from laser operation which could adversely affect working conditions or health; and
(i) in the case of lasers classified in Class 4, instructions for correct installation and installation, including building and spatial requirements.
Safety marks
(1) Lasers in Class 2 and above shall be marked with a safety mark (2) and a warning text in the Czech language (2) corresponding to the relevant laser class.
(2) Places in which maximum permissible values in the frequency range from 0 Hz to 1,7.1015 Hz may be exceeded shall be marked with safety marks according to another regulatory provision (2) and a ban on the entry of unauthorised natural persons.
(3) Places where the magnetic induction reference values applicable to natural persons in the communal environment in the frequency range 0 Hz to 300 Hz are exceeded shall be marked with a safety mark warning natural persons using a pacemaker to the potential risk.
Repeal
The following shall be deleted:
1. Government Decree No. 1 / 2008 Coll., on Health Protection against Non-Ionising Radiation.
2. Government Decree No. 106 / 2010 Coll., amending Government Decree No. 1 / 2008 Coll., on Health Protection against Non-Ionising Radiation.
Technical Regulation
This Government Regulation has been notified in accordance with Directive 98 / 34 / EC of the European Parliament and of the Council of 22 June 1998 laying down a procedure for the provision of information in the field of technical standards and regulations and of rules on information society services, as amended.
Efficacy
This Regulation shall enter into force on the 15th day following its publication.
Prime Minister:
Sobotka v. r.
Minister for Health:
MUDr.
Příloha č. 1
Annex No 1 to Government Regulation No 291 / 2015 Coll.
Maximum permissible values and reference values in the frequency band from 0 Hz to 300 GHz
1. The maximum permissible value for effects caused by electrical stimulation of the tissue by a field in the frequency band from 0 Hz to 10 MHz is given by the modified intensity of the electrical field Emod (t) induced in the tissue, which is the intensity of the electrical field induced in the tissue by a linear filter with the frequency characteristic G (Ä). In order to avoid exceeding the maximum permissible value, the modified intensity of the Emod (t) electric field shall not exceed 1 V.m-1 for employees and 0,2 V.m-1 for individuals in the communal environment.
1.1 When calculating the intensity of the electrical field induced in the tissue, spatial intermediation shall be carried out over the cube-shaped area of 2 × 2 × 2 mm3.
1.2 The Emod modified intensity filter is defined as follows:
(a) For exposure to the whole body except the head, the frequency characteristics of the filter shall be:
G (f) = 12.0.8.11 + jff0
f0 = 3000 Hz
where this is the frequency in hertz, etc = -1 is the imaginary unit. The frequency characteristics of filters are defined on the basis of the peripheral nervous system stimulation threshold.
b) The frequency characteristics of the filter shall be:
Gf = 12.0,05.1 + jff11 + jff01 + jff2
f0 = 25 Hz; f1 = 400 Hz; f2 = 3000 Hz
where this is the frequency in hertz, etc = -1 is the imaginary unit. The frequency characteristics of the filter are defined on the basis of the central nervous system stimulation threshold in the head (phosphens) and the vestibular apparatus (vertibular).
2. The maximum permissible value for electrical and magnetic field effects with a frequency below 1 Hz is defined as follows:
(a) The maximum permissible value for exposure to the electric field shall be given by the peak of the electrical intensity of 2x 20 000 V.m-1 for staff and 2 × 5 000 V.m-1 for individuals in the communal environment. This maximum allowable value provides individuals in the communal environment with protection against risks associated with secondary discharges, but generally does not provide workers with such protection. In the case of workers, the risk caused by secondary discharges must be minimised by technical measures or training.
(b) The maximum permissible value for exposure of the head or chest to the magnetic field is given by the peak value of the magnetic induction 2 T for employees and 0,4 T for individuals in the communal environment. This maximum permissible value provides protection against the risks associated with movement in a static magnetic field. In cases of trained staff who can be checked for speed and mode of movement, exposure to a magnetic field with a peak magnetic induction of 8 T may be allowed.
(c) The maximum permissible value for exposure of the limbs to the magnetic field is given by the peak of the magnetic induction 8 T for the staff. For natural persons, point (c) shall not apply.
In the cases referred to in points (a) to (c), field always means field without the presence of the exposed person.
3. The maximum permissible value for effects caused by increased tissue temperature in the 100 kHz to 6 GHz frequency band is defined as follows:
(a) The maximum permissible value for whole body exposure shall be given by the time-average of the specific absorption power (SAR) 0,4 W.kg-1 for employees and 0,08 W.kg-1 for individuals in the communal environment.
(b) The maximum permissible value for local exposure is given by the time-average of the specific absorption power of 10 W.kg-1 for employees and 2 W.kg-1 for individuals in the communal environment.
(c) The maximum permissible value for local exposure of the limbs is given by the time mean of the specific absorbed power of 20 W.kg-1 for employees and 4 W.kg-1 for individuals in the communal environment.
(d) The maximum permissible value for head exposure to an electromagnetic pulse field in a frequency range of 0,3 GHz to 6 GHz with pulses of less than 30 μs shall be given by a specific absorbed energy of 0,01 J.kg-1 for employees and 0,002 J.kg-1 for individuals in the communal environment. This maximum permissible value is used to exclude acoustic effects caused by the thermal expansion of the tissue.
In the cases referred to in points (a) to (d), the time limits shall be determined as averages over each six-minute interval. When calculating the local exposure, averaging shall be performed over a cube-shaped area with almost homogeneous electrical properties of 10 g.
4. The maximum permissible value for effects caused by an increase in tissue temperature in the frequency range from 6 GHz to 300 GHz is defined by the time mean of the luminous flux density 50 W.m-2 for employees and 10 W.m-2 for individuals in the communal environment. The exposure assessment shall be conducted on a flat average basis over every 20 cm2 of the exposed part of the body, with a maximum radiant flow density averaged over every 1 cm2 of the exposed surface not exceeding 1000 W.m-2 for employees and 200 W.m-2 for individuals in the communal environment. Time census shall be performed over each six-minute exposure interval for frequencies from 6 GHz to 10 GHz and over each exposure interval of T = 1,92.1011 / f1,05, where T is in minutes, and -s is in hertz, for frequencies from 10 GHz to 300 GHz.
5. The reference values are introduced for the intensity of the electric field E, magnetic induction B, radiant flow density S and contact current IC, in order to simplify the assessment of the exposure situation. The reference values are defined using the values EnLimit, BnLimit, SnLimit, Ic, nLimit, given in Tables 1 to 4 of this Annex. In order not to exceed the reference value, the following criteria shall be met for Hlim = 1 for employees and Hlim = 0,2 for individuals in the communal environment:
(a) Criterion for electrical tissue stimulation
IUPAC Name
IUPAC Name
a = 170V.m-1; b = 10-4 T
(b) Criterion for increasing tissue temperature
IUPAC Name
IUPAC Name
IUPAC Name
c = 61.107 / fv.m-1; d = 2 / fT
In order to avoid acoustic effects caused by the thermal expansion of the tissue, the peak radiant flow density on the head of the exposed person shall not exceed a thousand times the Slimit for a frequency range of 0,3 GHz to 6 GHz.
5.1. Where field values (En, Bn, Sn) are indicated in the criteria referred to in point 5 (a) or (b), they shall always be spatial maxima of the effective value of the individual frequency components of the field in the volume defined by the exposed person but not present. In addition, for the criterion referred to in point 5 (b), the effective values of the frequency components of the array shall be centered over each six-minute interval for frequencies from 100 kHz to 10 GHz and over each interval of T- 1.92.1011 / f1.05, where T is in minutes and -is in hertz for frequency ranges from 10 GHz to 300 GHz.
Table 1 Frequency course of the variable Elimit (effective values)
| ƒ[Hz] | Elimit [V.m-1] |
|---|---|
| 0 – 25 | 20 000 |
| 25 – 3 000 | 5.105 /ƒ |
| 3 000 – 3,6.106 | 170 |
| 3,6.106 – 107 | 6,1.108 /ƒ |
| 107 – 4.108 | 61 |
| 4.108 – 2.109 | 0,003.ƒ0.5 |
| 2.109 – 3.1011 | 137 |
Table 2 Frequency course of Blimit (effective values)
| ƒ[Hz] | Blimit [T] |
|---|---|
| 0 – 1 | 0,025 |
| 1 – 25 | 0,025 / ƒ |
| 25 – 300 | 10-3 |
| 300 – 3 000 | 0,3 / ƒ |
| 3 000 – 2.104 | 10-4 |
| 2.104 – 107 | 2 / ƒ |
| 107 – 4.108 | 2.10-7 |
| 4.108 – 2.109 | 10-11 ƒ0.5 |
| 2.109 – 3.1011 | 4,5.10-7 |
Table 3 Frequency course of Slimit
| ƒ/[Hz] | Slimit [W•m-2] |
|---|---|
| 107– 4.108 | 10 |
| 4.108 – 2.109 | ƒ/4.107 |
| 2.109 – 3.1011 | 50 |
Table 4 Frequency course of variable Iclimit (effective values)
| ƒ/[Hz] | Iclimit [A] |
|---|---|
| 0 – 2,5.103 | 10-3 |
| 2,5.103 – 105 | 4.10-7.ƒ |
| 105 – 108 | 0,04 |
Příloha č. 2
Annex No 2 to Government Regulation No 291 / 2015 Coll.
Maximum permissible values of ultraviolet, visible and infrared radiation of non-laser technological sources
1. Range of wavelength and definition of optical radiation types
1.1 Ultraviolet (UV) radiation is defined for the purposes of this Regulation as optical radiation in the wavelength range from 180 nm to 400 nm.
1.1.1 UVC radiation is defined as optical radiation in the wavelength range from 180 nm to 280 nm.
1.1.2 UVB radiation is defined as optical radiation in the wavelength range from 280 nm to 315 nm.
1.1.3 UVA radiation is defined as optical radiation in the wavelength range from 315 nm to 400 nm.
1.2 The visible radiation is optical radiation in the wavelength range from 400 nm to 780 nm.
1.3 Infrared (IR) radiation is defined as optical radiation in the wavelength range from 780 nm to 1 mm.
1.3.1. IRA radiation is defined as optical radiation in the wavelength range from 780 nm to 1400 nm.
1.3.2. IRB radiation is defined as optical radiation in the wavelength range from 1400 nm to 3000 nm.
1.3.3 IRC radiation is defined as optical radiation in the wavelength range from 3000 nm to 1 mm.
2. Definition of the quantities used
2.1 The basic radiometric values by which the maximum permissible values are determined are:
2.1.1 Eλ (λ, t) - spectral density of radiant flux - radiant flow per unit area perpendicular to the direction of propagation and per nanometer of wavelength (W.m-2.nm-1).
2.1.2 Lλ (λ, t) - spectral radiance - radiant flux per unit area perpendicular to the direction of propagation, to a unit spatial angle in the direction of propagation and to one nanometer of wavelength (W.m-2.sr-1.nm-1).
2.2 The biophysical effects of uncoherent optical radiation are highly dependent on the wavelength of optical radiation. The dependence is taken into account by the spectral weighting factors:
2.2.1 S (λ) - a spectral weighting coefficient taking into account the dependence of the effects of ultraviolet radiation on the eyes and skin on the wavelength (dimensionless).
2.2.2 R (λ) - a spectral weighting coefficient taking into account the dependence of the heat damage to the eye caused by infrared or visible radiation on the wavelength (dimensionless).
2.2.3 B (λ) - spectral weighting coefficient taking into account the dependence of the photochemical damage to the eye caused by blue light on the wavelength (dimensionless).
2.3 The maximum permissible values are specified in Table 1 of this annex and the integrals of spectral quantities are determined through the appropriate range of wavelength weighted by spectral weighting coefficients:
Table 1 Maximum permissible values for non-coherent optical radiation
| Index | Vlnová délka [nm] | Nejvyšší přípustná hodnota | Jednotky | Poznámka | Část těla | Riziko |
|---|---|---|---|---|---|---|
| a. | 180 – 400 (UVA, UVB a UVC) | Heff = 30 denní hodnota 8 hodin | [J.m-2] | oko - rohovka, spojivka, čočka, kůže | fotokeratitida zánět spojivek vznik očního zákalu erytém elastósa rakovina kůže | |
| b. | 315 – 400 (UVA) | HUVA = 104 denní hodnota 8 hodin | oko - čočka | vznik očního zákalu | ||
| c. | 300 – 700 (modré světlo) viz poznámka č. 1 | LB = 106.t-1 pro t ≤ 10 000 s | LB [W.m-2.sr-1] t [s] | Pro α ≥ 11 mrad LB je časově střední hodnota z LB(t) | oko - sítnice | photoretinitis, zánět sítnice vlivem intenzivního světla |
| d. | 300 – 700 (modré světlo) viz poznámka č. 1 | LB = 100 pro t > 10 000 s | [W.m-2.sr-1] | |||
| e. | 300 – 700 (modré světlo) viz poznámka č. 1 | EB = 100.t-1 pro t ≤ 10 000 s | EB [W-m-2] t [s] | pro α < 11 mrad viz poznámka č. 2 EB je časově střední hodnota z EB(t) | ||
| f. | 300 – 700 (modré světlo) viz poznámka č. 1 | EB = 0,01 t > 10 000 s | [W.m-2] | |||
| g. | 380 – 1 400 (viditelné a IRA) viz poznámka č. 3, 5 | LR = 2,8.107.C-1α pro t > 10 s | [W.m-2.sr-1] | Cα = 1,7 pro α ≤ 1,7 mrad Cα = α pro 1,7 ≤ α ≤ 100 mrad Cα = 100 pro α > 100 mrad λ1 =380 nm λ2 = 1400 nm LR je časově střední hodnota z LR(t) | popálení sítnice | |
| h. | 380 – 1 400 (viditelné a IRA) viz poznámka č. 3, 5 | LR = 5.107..t-0,25 pro 10 μs ≤ t ≤ 10 s | LR [W.m-2.sr-1] t [s] | |||
| i. | 380 – 1 400 (viditelné a IRA) viz poznámka č. 3, 5 | LR = 8,89.108. pro t < 10 μs | [W.m-2.sr-1] | |||
| j. | 780 – 1 400 (IRA) viz poznámka č. 3, 5 | LR = 6.106. pro t > 10 s | [W.m-2.sr-1] | Cα = 11 pro α ≤ 11 mrad Cα = α pro 11 ≤ α ≤ 100 mrad Cα = 100 pro α > 100 mrad (zorné pole pro měření: 11 mrad) λ1 = 780 nm λ2 = 1400 nm LR je časově střední hodnota z LR(t) | ||
| k. | 780 – 1 400 (IRA) viz poznámka č. 3, 5 | LR = 5.107..t-0,25 pro 10 μs ≤ t ≤ 10 s | LR [W.m-2.sr-1] t [s] | |||
| l. | 780 – 1 400 (IRA) viz poznámka č. 3, 5 | LR = 8,89.108. pro t < 10 μs | [W.m-2.sr-1] | |||
| m. | 780 – 3 000 (IRA a IRB) viz poznámka č. 3 | EIR = 18000.t-0,75 pro t ≤ 1 000 s | EIR [W.m-2] t [s] | EIR je časově střední hodnota z EIR(t) | oko - rohovka, čočka | popálení rohovky vznik očního zákalu |
| n. | 780 – 3 000 (IRA a IRB) viz poznámka č. 3 | EIR = 100 pro t > 1 000 s | EIR [W.m-2] | |||
| o. | 380 – 3 000 (viditelné, IRA a IRB) viz poznámka č. 3, 4 | Hkůže = 20000.t0,25 pro t < 10 s | Hkůže [J.m-2] t [s] | kůže | popálení |
Note 1: The wavelength range from 300 nm to 700 nm includes UVB, UVA and most visible radiation. However, related risks are commonly referred to as "blue light 'risks. Exactly expressed, the blue light only covers the wavelength range from approximately 400 nm to 490 nm.
Note 2: In the case of fixed fixation of very small sources with a visual angle < 11 mrad, LB (t) may be converted to EB (t). This normally applies only to ophthalmologic devices or to stabilised eye during anesthesia. The maximum viewing time of the source shall be calculated by the formula: tmax = 100 / EB, where EB is expressed in W.m-2. This value does not exceed 100 seconds due to eye movements in normal vision
Note 3: Even if the radiation has a component in the IRC, it is sufficient to perform an assessment of the maximum permitted values for the IRA and IRB areas.
Note 4: For longer exposure periods it is assumed that the exposed person is protected by a natural aversion to high temperature and avoids excessive exposure before the skin burns.
Note 5: A is the visual angle below which the optical radiation source, expressed in radians (hints), is seen by the eye.
Table 2 Spectral weighting coefficient S (λ)
| λ [nm] | S (λ) | λ [nm] | S (λ) | λ [nm] | S (λ) | λ [nm] | S (λ) | λ [nm] | S (λ) |
|---|---|---|---|---|---|---|---|---|---|
| 180 | 0,0120 | 228 | 0,1737 | 276 | 0,9434 | 324 | 0,000520 | 372 | 0,000086 |
| 181 | 0,0126 | 229 | 0,1819 | 277 | 0,9272 | 325 | 0,000500 | 373 | 0,000083 |
| 182 | 0,0132 | 230 | 0,1900 | 278 | 0,9112 | 326 | 0,000479 | 374 | 0,000080 |
| 183 | 0,0138 | 231 | 0,1995 | 279 | 0,8954 | 327 | 0,000459 | 375 | 0,000077 |
| 184 | 0,0144 | 232 | 0,2089 | 280 | 0,8800 | 328 | 0,000440 | 376 | 0,000074 |
| 185 | 0,0151 | 233 | 0,2188 | 281 | 0,8568 | 329 | 0,000425 | 377 | 0,000072 |
| 186 | 0,0158 | 234 | 0,2292 | 282 | 0,8342 | 330 | 0,000410 | 378 | 0,000069 |
| 187 | 0,0166 | 235 | 0,2400 | 283 | 0,8122 | 331 | 0,000396 | 379 | 0,000066 |
| 188 | 0,0173 | 236 | 0,2510 | 284 | 0,7908 | 332 | 0,000383 | 380 | 0,000064 |
| 189 | 0,0181 | 237 | 0,2624 | 285 | 0,7700 | 333 | 0,000370 | 381 | 0,000062 |
| 190 | 0,0190 | 238 | 0,2744 | 286 | 0,7420 | 334 | 0,000355 | 382 | 0,000059 |
| 191 | 0,0199 | 239 | 0,2869 | 287 | 0,7151 | 335 | 0,000340 | 383 | 0,000057 |
| 192 | 0,0208 | 240 | 0,3000 | 288 | 0,6891 | 336 | 0,000327 | 384 | 0,000055 |
| 193 | 0,0218 | 241 | 0,3111 | 289 | 0,6641 | 337 | 0,000315 | 385 | 0,000053 |
| 194 | 0,0228 | 242 | 0,3227 | 290 | 0,6400 | 338 | 0,000303 | 386 | 0,000051 |
| 195 | 0,0239 | 243 | 0,3347 | 291 | 0,6186 | 339 | 0,000291 | 387 | 0,000049 |
| 196 | 0,0250 | 244 | 0,3471 | 292 | 0,5980 | 340 | 0,000280 | 388 | 0,000047 |
| 197 | 0,0262 | 245 | 0,3600 | 293 | 0,5780 | 341 | 0,000271 | 389 | 0,000046 |
| 198 | 0,0274 | 246 | 0,3730 | 294 | 0,5587 | 342 | 0,000263 | 390 | 0,000044 |
| 199 | 0,0287 | 247 | 0,3865 | 295 | 0,5400 | 343 | 0,000255 | 391 | 0,000042 |
| 200 | 0,0300 | 248 | 0,4005 | 296 | 0,4984 | 344 | 0,000248 | 392 | 0,000041 |
| 201 | 0,0334 | 249 | 0,4150 | 297 | 0,4600 | 345 | 0,000240 | 393 | 0,000039 |
| 202 | 0,0371 | 250 | 0,4300 | 298 | 0,3989 | 346 | 0,000231 | 394 | 0,000037 |
| 203 | 0,0412 | 251 | 0,4465 | 299 | 0,3459 | 347 | 0,000223 | 395 | 0,000036 |
| 204 | 0,0459 | 252 | 0,4637 | 300 | 0,3000 | 348 | 0,000215 | 396 | 0,000035 |
| 205 | 0,0510 | 253 | 0,4815 | 301 | 0,2210 | 349 | 0,000207 | 397 | 0,000033 |
| 206 | 0,0551 | 254 | 0,5000 | 302 | 0,1629 | 350 | 0,000200 | 398 | 0,000032 |
| 207 | 0,0595 | 255 | 0,5200 | 303 | 0,1200 | 351 | 0,000191 | 399 | 0,000031 |
| 208 | 0,0643 | 256 | 0,5437 | 304 | 0,0849 | 352 | 0,000183 | 400 | 0,000030 |
| 209 | 0,0694 | 257 | 0,5685 | 305 | 0,0600 | 353 | 0,000175 | ||
| 210 | 0,0750 | 258 | 0,5945 | 306 | 0,0454 | 354 | 0,000167 | ||
| 211 | 0,0786 | 259 | 0,6216 | 307 | 0,0344 | 355 | 0,000160 | ||
| 212 | 0,0824 | 260 | 0,6500 | 308 | 0,0260 | 356 | 0,000153 | ||
| 213 | 0,0864 | 261 | 0,6792 | 309 | 0,0197 | 357 | 0,000147 | ||
| 214 | 0,0906 | 262 | 0,7098 | 310 | 0,0150 | 358 | 0,000141 | ||
| 215 | 0,0950 | 263 | 0,7417 | 311 | 0,0111 | 359 | 0,000136 | ||
| 216 | 0,0995 | 264 | 0,7751 | 312 | 0,0081 | 360 | 0,000130 | ||
| 217 | 0,1043 | 265 | 0,8100 | 313 | 0,0060 | 361 | 0,000126 | ||
| 218 | 0,1093 | 266 | 0,8449 | 314 | 0,0042 | 362 | 0,000122 | ||
| 219 | 0,1145 | 267 | 0,8812 | 315 | 0,0030 | 363 | 0,000118 | ||
| 220 | 0,1200 | 268 | 0,9192 | 316 | 0,0024 | 364 | 0,000114 | ||
| 221 | 0,1257 | 269 | 0,9587 | 317 | 0,0020 | 365 | 0,000110 | ||
| 222 | 0,1316 | 270 | 1,0000 | 318 | 0,0016 | 366 | 0,000106 | ||
| 223 | 0,1378 | 271 | 0,9919 | 319 | 0,0012 | 367 | 0,000103 | ||
| 224 | 0,1444 | 272 | 0,9838 | 320 | 0,0010 | 368 | 0,000099 | ||
| 225 | 0,1500 | 273 | 0,9758 | 321 | 0,000819 | 369 | 0,000096 | ||
| 226 | 0,1583 | 274 | 0,9679 | 322 | 0,000670 | 370 | 0,000093 | ||
| 227 | 0,1658 | 275 | 0,9600 | 323 | 0,000540 | 371 | 0,000090 |
Table 3 Spectral weighting coefficient B (λ), R (λ)
| λ [nm] | B (λ) | R (λ) |
|---|---|---|
| 300 ≤ λ < 380 | 0,01 | — |
| 380 | 0,01 | 0,1 |
| 385 | 0,013 | 0,13 |
| 390 | 0,025 | 0,25 |
| 395 | 0,05 | 0,5 |
| 400 | 0,1 | 1 |
| 405 | 0,2 | 2 |
| 410 | 0,4 | 4 |
| 415 | 0,8 | 8 |
| 420 | 0,9 | 9 |
| 425 | 0,95 | 9,5 |
| 430 | 0,98 | 9,8 |
| 435 | 1 | 10 |
| 440 | 1 | 10 |
| 445 | 0,97 | 9,7 |
| 450 | 0,94 | 9,4 |
| 455 | 0,9 | 9 |
| 460 | 0,8 | 8 |
| 465 | 0,7 | 7 |
| 470 | 0,62 | 6,2 |
| 475 | 0,55 | 5,5 |
| 480 | 0,45 | 4,5 |
| 485 | 0,32 | 3,2 |
| 490 | 0,22 | 2,2 |
| 495 | 0,16 | 1,6 |
| 500 | 0,1 | 1 |
| 500 < λ ≤ 600 | 100,02.(450-λ) | 1 |
| 600 < λ ≤ 700 | 0,001 | 1 |
| 700 < λ ≤ 1 050 | — | 100,002.(700-λ) |
| 1 050 < λ ≤ 1 150 | — | 0,2 |
| 1 150 < λ ≤ 1 200 | — | 0,2·100,02·(1150-λ) |
| 1 200 < λ ≤ 1 400 | — | 0,02 |
Příloha č. 3
Annex 3 to Government Regulation No 291 / 2015 Coll.
Maximum permitted laser radiation
1. Explanation of terms and quantities
1.1 Linear laser generation mode - laser generation mode at which the laser emits continuously for more than 0,25 seconds
1.2 Pulse mode of laser radiation generation - laser radiation generation mode in which the radiant laser energy is emitted in the form of pulses not exceeding 0,25 s and having a repetitive frequency equal to or less than 1 Hz. Laser operating in this mode is referred to as impulse laser.
1.3 The diameter of the beam of laser radiation - the distance between the opposite points of the beam where the density of radiant energy (or radiant flow density) is equal to 1 / e-2 (e stands for Euler's number) times the maximum radiant energy density (or radiant flow density) of the laser output beam.
1.4. Divergence of the beam of laser radiation - the whole angle of the beam spacing measured between the opposite lines passing through uniform beam points where the luminous flux density is 1 / e-2 times the maximum luminous flux density in the same cross section. It's in radians.
1.5 Length of pulse of laser radiation - time over which the radiant flow of laser output beam exceeds 0,5 times the maximum value.
1.6. Radiant flux density of laser radiation E (t) - laser radiation output passing through a limit hole divided by the area of the limit hole (W.m-2).
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Regulation Information
| Citation | Government Regulation No. 291 / 2015 Coll., on Health Protection against Non-Ionising Radiation |
|---|---|
| Regulation Type | Regulation |
| Author | - |
| Collection | Code of Laws |
| Date of Promulgation | 03.11.2015 |
|---|---|
| Effective from | 18.11.2015 |
| Effective until | - |
| Status | Valid |
The regulation text is for informational purposes only.
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