31966L0045
Official Journal of the European Communities 265
26.11.66 OFFICIAL JOURNAL OF THE EUROPEAN COMMUNITIES 3693 /66
COUNCIL DIRECTIVE of 27 October 1966
amending the Directives laying down the basic standards for the protection of the health of workers and the general public against the dangers arising from ionising radiations
THE COUNCIL OF THE EUROPEAN ATOMIC arising from ionising radiations, as amended by the ENERGY COMMUNITY, Council Directive of 5 March 1962,3 shall be amended in accordance with Articles 2 to 20. Having regard to the Treaty establishing the European Atomic Energy Community, and in particular Articles 31 and 32 thereof ; Article 2
Having regard to the request of the Federal Republic In Article 1 ( 1 ) the seventh and eighth subparagraphs of Germany of 23 March 1960 for the basic standards shall be replaced by the following : to be revised and supplemented ; 'Exposure': any exposure of persons to ionising Having regard to the Opinion of the specialist group radiation ; a distinction is made between : appointed by the Scientific and Technical Committee from among scientific experts in the Member States ; — external exposure , where the source is outside the body ; Having regard to the Opinion of the Economic and Social Committee ; — internal exposure, which is caused by the intro duction of radioactive substances into the body ; and Having regard to the proposal from the Commission ;
— total exposure, which is the sum of external After consulting the European Parliament1 ; exposure and internal exposure.
Whereas the basic standards must be adjusted in accordance with the most recent scientific data ; 'Planned abnormal exposure' : external and internal (or external or internal) exposure as a result of Whereas it is necessary to take account of experience which a maximum permissible dose is exceeded in acquired from the practical application of the basic occupationally exposed persons, and for which the standards by the Member States ; risk has previously been studied and accepted. It may be authorised only in cases of absolute necessity. HAS ADOPTED THIS DIRECTIVE : ' Unplanned abnormal exposure': external and internal (or external or internal) exposure which Article 1 is of a fortuitous nature and which involves ex ceeding a maximum permissible dose for occu The Council Directives of 2 February 1959 laying down pationally exposed persons . the basic standards for the protection of the health of workers and the general public against the dangers
2 OJ No 11 , 20.2.1959, p . 221 /59 . 1 OJ No 96, 2.6.1965, p . 1696/65 . 3 OJ No 57, 9.7.1962, p . 1633/62.
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Article 3 A single dose of 3 rem must be avoided wherever possible.' The Table in Article 1 (4) shall be replaced by the Subparagraphs (b) to (d) shall remain unaltered. following :
Article5¶
Articles 8 and 9 shall be deleted. X- and gamma rays, electrons and beta rays of all energies 1 Neutrons 2 to 105 2 Article 6
Protons 10 ' Article 10 shall be renumbered Article 8 and be Alpha particles 10 amended to read as follows : Heavy recoil nuclei 20 'Article 8
1 In the case of irradiation of the lenses of the eyes, the RBE must be Where there is partial exposure of the body, during multiplied by : which the doses received by the blood-forming — a factor of 1 when its value is equal to 1 ; — a factor of 3 when its value is higher than or equal to 10 ; organs and the gonads or by one or other of those — a factor between 1 and 3 , obtained by interpolation, for RBE values organs do not exceed the limits set by the basic between 1 and 10 . formula, the maximum permissible dose shall be : 2 See Annex 2 . (a) for external exposure of the extremities (hands , forearms, feet, ankles), 15 rem per thirteen weeks and 60 rem per year ; Article 4 ( b) for external exposure of the skin or bone, with (a) The heading of Article 7 shall be deleted. the exception of the extremities specified in (a) above, 8 rem per thirteen weeks and 30 rem per year ; (b) Article 7 ( 1 ) shall be replaced by the following : (c) for exposure of other organs individually, 4 rem '§1 — The maximum permissible dose for an per thirteen weeks and 13 rem per year.' occupationally exposed person shall be expressed in rem and shall be calculated by reference to age and an average annual dose of 5 rem. Article 7
The maximum permissible dose for a person of a Article 11 shall be renumbered Article 9 . given age, received by the blood-forming organs and the gonads (or by one or other of those organs), shall be calculated in accordance with the Article 8 basic formula : D = 5 (N — 18 ) Article 12 shall be renumbered Article 10. The first where D — dose in rem sentence of that Article shall be amended to read as follows : N = age in years .' 'For the population as a whole, the maximum permissible genetically significant dose shall be (c) Article 7 (3) shall be amended to read as follows : 5 rem per head, accumulated up to thirty years . of age.' '§3 — The maximum cumulative dose in any period of thirteen consecutive weeks shall not exceed 3 rem. The following shall be taken into Article 9 ' account in calculating the dose : Article 13 shall be renumbered Article 11 . Paragraph 3 (a) Persons aged eighteen and over may receive a of that Article shall be amended to read as follows : cumulative dose of 3 rem (distributed over thirteen consecutive weeks), provided that the ' The Table in Annex 2 shows the neutron flux as basic formula is complied with and that the imparting a dose rate of 2'5 millirem/hours as a dose accumulated over one year never exceeds function of the neutron energy and the correspond 12 rem . ing RBE values .'
Official Journal of the European Communities 267
Article10¶
Article 14 shall be renumbered Article 12 and amended ABNORMAL EXTERNAL EXPOSURE to read as follows :
'Article 12 § 1 — "Planned abnormal external exposure"
§ 1 — "Maximum permissible contamination of (a) The dose delivered on one occasion or more in persons" means contamination resulting from the the course of a planned abnormal external inhalation or ingestion of air or water contaminated exposure shall not exceed 12 rem. This dose to the maximum permissible concentrations calcu shall be added to the dose accumulated up to lated in accordance with Annex 3 . the time of the abnormal exposure.
§ 2 — The values shown in Annex 3 are applicable (b) If the cumulative dose thus calculated is below for determining the maximum permissible concen the maximum permissible dose calculated trations in inhaled air or in drinking water ; they according to the basic formula set out in must be considered as average values covering a Article 7 ( 1 ) and if the quarterly dose exceeds period of thirteen consecutive weeks . 3 rem, subsequent exposures shall be reduced to a maximum dose of 1*5 rem per quarter until § 3 — These values relate to continuous exposure, such time as the values derived from applying calculated on the basis of one hundred and sixty the provisions of Article 7 (3 ) are restored. eight hours per week, for occupationally exposed persons. They must be multiplied by a factor of 3 (c) If the cumulative dose thus calculated exceeds to relate to a working week of forty to forty-eight the maximum permissible dose calculated hours . according to the basic formula set out in Article 7 ( 1 ), subsequent exposures shall be § 4 — The introduction at a single time of a quantity reduced to a maximum dose of 2*5 rem per of radioactive nuclides equal to that which would year until such time as the cumulative dose be introduced in thirteen consecutive weeks on the conforms again to the basic formula. basis of the maximum permissible concentrations as calculated from Annex 3 must be avoided (d) No woman of reproductive capacity may be wherever possible. subjected to such an exposure .
§5 — Outside the controlled areas, for persons belonging to the population group defined in (c) §2 — "Unplanned abnormal external exposure" of the fifth subparagraph of Article 1 (2), the maximum permissible concentrations which deter (a) When a dose delivered during an unplanned mine the maximum permissible contaminations abnormal external exposure does not exceed 25 shall be laid down as one-tenth of the values shown rem, paragraph 1 (b) or (c) shall be applicable. in the Tables in Annex 3 . They must be con (b) When the dose exceeds 25 rem, Article 25 (3) sidered as average values relating to a period of a shall be applicable. year. § 6 — Where contamination results from a mixture of radioactive nuclides, Table C , D or E in Annex 3 , §3 — "Partial planned abnormal external exposure" as the case may be, shall apply.' (a) The dose delivered on one or more occasions in the course of a partial planned abnormal Article 11 external exposure must not exceed : Article 15 shall be deleted. — in the case of the extremities (hands , fore arms , feet, ankles) : 60 rem ; Article 12 — in the case of the skin (with the exception of that of the extremities) : 30 rem ; The provisions of the new Articles 13, 14 and 15 shall be as follows : — in the case of the lenses of the eyes : 15 rem.
The doses received shall be added to the doses 'Article 13 accumulated in the current year. TOTAL EXPOSURE (b) For subsequent exposures of the extremities, In the case of total exposure, the sum of the doses the skin (with the exception of that of the due to external exposure and internal exposure extremities) and the lenses of the eyes, the shall be calculated by an appropriate method and maximum permissible doses to be taken into shall be within the maximum permissible doses. consideration shall, until such time as the
268 Official Journal of the European Communities
integrated values derived from applying the equal to half the values calculated in accordance provisions of that Article are restored, be with Annex 3 and must remain so for such time reduced to half of the dose laid down in as would be required to accumulate, by con Article 8 . tinuous exposure under the same conditions , the quantity of radionuclides introduced into §4 — "Partial unplanned abnormal exposure" the body as a result of the planned abnormal internal exposure. (a) When a dose delivered in the course of a partial unplanned abnormal external exposure does (d) No woman of reproductive capacity may be not exceed : subjected to such an exposure.
— 120 rem in the case of the extremities (hands , §2 — "Unplanned abnormal internal exposure" forearms , feet, ankles) ; (a) "When the quantity of radioactive nuclides — 60 rem in the case of the skin (with the introduced into the body during an unplanned exception of that of the extremities) ; abnormal internal exposure is less than double — 30 rem in the case of the lenses of the eyes ; the quantity as laid down in paragraph 1 (a), the provisions of paragraph 1 (c) shall be paragraph 3 (b) shall be applicable. applicable.
(b) When the contamination exceeds the limit laid (b) When the dose exceeds the values specified down in (a) of this paragraph, Article 25 (3) in (a), Article 25 (3) shall be applicable. shall be applicable.'
Article15¶
ABNORMAL INTERNAL EXPOSURE Article 16 shall be replaced by the following : § 1 — "Planned abnormal internal exposure" 1Article 16 (a) A planned abnormal internal exposure shall be The values of maximum permissible exposure and permitted only if it cannot be avoided by taking contamination applicable to conditions other than all the necessary safety measures . Should such those obtaining in the case of occupationally exposure prove unavoidable, the quantity of exposed persons shall be calculated from the maxi radioactive nuclides introduced into the body mum permissible doses as laid down in Part III.' at one time or more than once must not exceed the quantity which would result from exposure, over a period of one year, to the maximum permissible concentrations as shown in Annex 3 Article 14 for occupationally exposed persons .1 Article 25 (3) shall be replaced by the following : (b) Every planned abnormal internal exposure must be entered in the physical control records '§3 — Special surveillance (Article 22 (2)) and in the medical file of the (a) Special surveillance shall be arranged in the worker concerned (Article 26), together with event of abnormal exposure. the estimated value of the absorbed dose and of the uptake resulting from that exposure. (b) Routine medical examinations shall be sup plemented by any examinations, decontami (c) In the case of subsequent internal exposure, the nation measures and urgent remedial treatment maximum permissible concentrations to be considered by the medical practitioner .to be taken into consideration must be at the most necessary . (c) .The medical practitioner shall decide whether the worker should remain at work, be moved 1 This quantity X (in curies) may be calculated from the away, or be isolated and whether urgent medical . maximum permissible concentrations in air for occu pationally exposed persons for forty to forty-eight hours treatment should be given.' per week by the following formula : X = 2500 . q q being three times the value shown in the Tables in Article 15 Annex 3 . The coefficient 2500 is obtained on the basis of an inhalation of 10 m3 of air per day for five days per week and fifty weeks per year. Annex 1 shall be replaced by the following :
Official Journal of the European Communities 269
'ANNEX 1
1 — Activities .below which the requirements for reporting and obtaining prior authorisation may be waived :
Nuclides of very high radiotoxicity : 10"7 curies ;
Nuclides of high radiotoxicity : 10"6 curies ;
Nuclides of moderate radiotoxicity : 10-5 curies ;
Nuclides of low radiotoxicity : 10"4 curies ;
2 — The principal radioactive nuclides are classified as follows, according to their relative radiotoxicity :
(a) Very high radiotoxicity :
Ac227 Am241 Am242m Am243 Cf249 Cf250 Cf251 Cf252 Cf254 Cm242 Cm243 Cm244 Cm245 Cm246 Cm248 Es254 Es255 Np237 Pa231 Pb210 Po210 Pu238 Pu239 Pu240 Pu241 Pu242 Ra223 Ra226 Ra228 •Th227 Yh228 Th230 U230 U u233 U234
(b) High radiotoxicity :
Ac228 Ag110m Am242 At211 Ba140 Bi207 Bi210 Bk249 Ca45 Cd115m Ce144 Cf253 CI36 Cm247 Co56 Co60 Cs134 Cs137 Es253 Es254m Eu152 ( 13 years) Eu154 Fm255 Fm256 Hf181 I124 I126 I131 I133 In114m Ir192 Mn54 Na22 Pa230 Pb212 Pu244 Ra224 Ru106 Sb124 Sb125 Sc46 Sr89 Sr90 Ta182 Tb160 Ye127m Ye129m Th234 Tl Tm170 U236 Y91 Zr
(c) Moderate radiotoxicity :
A41 Ag105 Ag111 Am244 As73 As74 As76 As77 Au196 Au198 Au199 Ba131 Be7 Bi206 Bi212 Bk250 Br82 C14 Ca47 Cd109 Cd115 Ce141 Ce143 CI38 Co57 Co58 Cr51 Cs131 Cs136 Cu64 Dy165 Dy166 Er169 Er171 Eu152 (9 h) Eu155 F18 Fe52 Fe55 Fe59 Fm264 Ga72 Gd153 Gd159 Hg197 Hg197m Hg203 Ho166 !130 I132 I134 I135 Jn115m Jr190 Ir194 K42 K43 Kr85m Kr87 La140 Lu177 Mn52 Mn56 Mo" Na24 Nb93m Nb95 Nd147 Nd149 Ni63 Ni65 Np239 Os185 Os191 Os193 P32 Pa233 Pb203 Pd103 Pd109 Pm147 Pm149 Pr142 Pr143 Pt191 Pt193 Pt197 Pu243 Rb86 Re183 Re186 Re188 Rh105 Rn220 Rn222 Ru97 Ru103 Ru105 S35 Sb122 Sc47 Sc48 Se75 Si31 Sm151 Sm153 Sn113 Sn125 Sr85 Sr91 Sr92 Tc98 Tc97 Tc97m Tc" Te125m Te127 Te129 Te131m Te132 Th231 Tl200 Tl201 Tl202 Tm171 U240 _J_ Νp240 V48 ^181 ^185 "W187 Xe135 Y90 Y92 Y93 Yb175 ^η65 Zn69m Zr97
(d) Low radiotoxicity :
A37 Cm249 Co58m Cs134m Cs135 Ge71 H3 I129 In113m In115 Kr85 Nb97 Nd144 Ni59 O 15 Os191m Pt193m Pt197m Rb87 Re187 Sm147 Sj.85m T(.96m Tc99m Th nat. !- Th232 U nat. ::"'f U235 U238 Xe131m Xe133 Y91m Zn69 Zr93
§ 3 — In the case of the nuclides In115, Nd144, Rb87, Re187, Sm147 the requirements for reporting and obtaining prior authorisation may be waived, irrespective of the quantities used.
§ 4 — In the case of a mixture of radioactive nuclides belonging to different radiotoxicity groups, the requirements for reporting and obtaining prior authorisation may be waived if the sum of the ratios between the activity of each of the radioactive nuclides and the limit laid down in paragraph 1 for the group to which it belongs is less than 1 .
* By custom, one curie of natural thorium corresponds to : 3-7 . 1010 dis/sec of Th23* and 3-7 . 1010 dis/sec of Th238. ** By custom, one curie of natural uranium corresponds to : 3-7 . 1010 dis/sec of U238, 3-7 . 1010 dis/sec of U234 and 1-7 . 109 dis/sec of U836.'
270 Official Journal of the European Communities
5 — The radionuclides not shown in the radiotoxicity groups in paragraph 2 and the radio toxicity of which is uncertain or unknown must be considered as belonging to the highest radiotoxicity category.'
Article16¶
Annex 2 shall be replaced by the following :
'ANNEX 2
Table showing the neutron flux as delivering a dose-rate of 2-5 mrem per hour as a function of the neutron energy and the corresponding RBE values
Neutron flux Neutron energy RBE1 ( neutrons/cm2 sec)
Thermal 3 670 100 eV 2 500 5 keV ' 2-5 570
20 keV . 5 280 100 keV 8 . 80 0-5 MeV 10 30 1 MeV 10-5 18 2-5 MeV ■ 8 20 5 MeV 7 18 10 MeV 6;5 17
1 In the case of neutrons of unknown energy the RBE is taken as being 10.'
Article17¶
In Annex 3 , Table A shall be amended to read as follows :
(a) The title shall be worded as follows :
'A. Maximum permissible concentration (MPC) of identified radionuclides in drinking water and in air inhaled for continuous exposure of occupationally exposed- persons'
The sentence after the title—'(Table based on values recommended in 1959 by the International Commission on Radiological Protection) (ICRP)'—shall be deleted.
The column headings shall be as follows :
Element Form MPC in water MPC in air Radionuclide (Atomic number) (b) (c) ' (c)
(b) In Note (c) the words 'Article 14 (4), (5) and (6)' shall be replaced by the words 'Article 12 (3)'.
Official Journal of the European Communities 271
(c) The data concerning the elements americium, berkelium, californium, curium, plutonium, strontium and uranium shall be replaced by the following :
Element Form MPC in water MPC in air Radionuclide (Atomic number) b c C
Americium Am241 sol. 4 . IO '5 2 . IO "12 (95) insol . 3 . IO "4 4 . IO " 11
Am242m sol. 4 . IO "5 2 . IO -12 insol . 9 . IO "4 9 . IO -11
Am242 sòl . IO "3 IO "8 insol . IO "3 2 . IO "8
Am243 . sol. 4 . IO "5 2 . IO "12 insol . 3 . IO '4 4 . IO '11
Am244 sol. 0-05 IO "6 insol . 0-05 8 . IO "6
Berkelium Bk249 sol. 6 . IO "3 3 . IO 10 (97) insol . 6 . IO "3 4 . IO '8
Bk250 sol. 2 . IO "3 5 . IO "8 insol. 2 . IO "3 4 . IO "7
Californium Cf249 sol. *4 . IO "5 5 . IO "13 (98) insol . 2 . IO "4 3 . IO 11
Cf250 sol. 1 . io -4 2 . IO '12 insol . 3 . IO "4 3 . IO '11
Cf251 sol. 4 . IO "5 6 . IO "13 insol. 3 . IO "4 3 . IO '11
Cf252 sol. 7 . IO "5 2 . IO '12 insol . 7 . IO '5 1 . io -11
Cf253 1 sol. io -3 3 . IO '10 insol . io -3 3 . 10 10
Cf254 sol. · IO "6 ' 2 . IO '12 insol . IO "6 2 . 10 12
Curium Cm242 sol. 2 . IO "4 4 . IO 11 (96) insol . 2 . IO "4 6 . IO 11
Cm243 sol. 5 . IO '5 2 . IO "12 insol . 2 . IO '4 3 . IO "11
Cm244 sol. 7 . IO '5 3 . IO "12 insol . 3 . IO "4 3 . IO "11
Cm245 sol. 4 . IO "5 2 . IO '12 insol . 3 . IO '4 4 . IO "11
Cm246 sol. 4 . IO "5 2 . IO "12 insol. 3 . IO "4 4 . IO 11
Cm247 sol. 4 . IO "5 2 . IO "12 insol . 2 . IO '4 4 . IO "11
Cm248 sol. 4 . IO "6 2 . IO "13 insol . IO "5 4 . IO "12
Cm249 sol. 0-02 4 . IO "6 insol. 0-02 4 . 10-®
272 Official Journal of the European Communities
Element : Form MPC in water MPC in air ( Atomic number)' Radionuclide b c c
Plutonium p u238 sol. 5 . IO "5 7 . IO "13 (94) . insol . 3 . IO "4 1 . IO "11
Pu239 sol. 5 . IO "5 6 . IO '13 insol . 3 . IO '4 1 . IO "11
Pu240 sol. 5 . IO "5 6 . IO "13 insol . 3 . IO "4 1 . IO "11
Pu241 sol. 2 . IO '3 3 . IO "11 insol . 1 . io -2 1 . IO "8
Pu242 sol. 5 . IO "5 6 . IO "13 insol . 3 . 10 - 4 1 . IO "11
Pu243 sol. 3 . IO "3 6 . IO "7 insol. 3 . IO "3 8 . IO "7
Pu244 sol. 4 . IO "5 6 . IO "13 insol . IO "4 IO "11
Strontium Sr85m sol. 7 . IO "2 1 . io -5 (38 ) insol . 7 . IO "2 1 . io -5
Sr85 sol. 1 . IO "3 8 . IO "8 insol . 2 . IO "3 4 . IO '8 '
Sr88 sol. 1 . IO -4 1 . IO -8 insol . 3 . IO "4 1 . IO "8
* Sr90 sol. 4 . IO "6 4 . IO '10 insol . 4 . IO 4 2 . IO -9
Sr91 sol. 7 . IO "4 2 . IO "7 insol . 5 . IO "4 9 . IO "8
Sr92 sol. 7 . IO "4 2 . IO "7 insol . 6 . IO "4 ' 1 . IO "7
Uranium U230 sol. 2 . IO '5 io -10 · (92) insol . 5 . IO '5 4 . IO '11
U232 sol. 8 . IO "6 3 . IO '11 insol. 3 . IO "4 9 . IO "12
u238 sol. 4 . IO "5 2 . IO "10 insol. 3 . IO '4 4 . IO "11
U284 sol. 4 . IO "5 2 . IO "10 insol. 3 . IO "4 4 . IO :11
U235 sol. 4 . IO "5 2 . IO "10 . insol. 3 . IO "4 4 . IO "11
U236 sol. 5 . IO "5 2 . IO "10 insol. 3 . IO '4 4 . IO "11
U238 sol. 6 . IO "6 3 . IO "11 · insol. 4 . 10'"4 5 . IO '11
U nat. * sol. 6 . IO "6 3 . IO "11 insol. 2 . IO "4 2 . IO 11
* By custom, one curie of natural uranium corresponds to : 3-7 . 1010 dis/sec of U238, 3-7 . 1010 dis/sec of U234 and 1-7 . 109 dis/sec of U235.
Official Journal of the European Communities 273
Element Form MPC in water MPC in air Radionuclide (Atomic number) fa C C Uranium (Cont'd) U240 + Np240 sol. 3 . IO "4 - 8 . IO "8 (92) insol . 3 . 10 -4 6 . IO "8
(d) The following data concerning the elements einsteinium and fermium shall be inserted in the Table :
Element Form MPC in water MPC in air Radionuclide {Atomic number) . b C c
Einsteinium Es253 sol. 2 . IO "4 3 . IO "10 (99) insol . 2 . IO "4 2 . IO "10
Es254m sol. 2 . IO "4 2 . IO "9 insol . 2 . IO "4 2 . IO "9
Es254 sol. io -4 6 . IO 12 insol . IO "4 4 . IO " 11
Es255 sol. 3 . IO "4 2 . IO '10 insol . 3 . IO "4 10-10
Fermium Fm254 sol. IO "3 2 . IO "8 ( 100) insol . IO "3 2 . IO "8
Fm255 sol. 3 . IO '4 6 . IO 9 insol . 3 . IO "4 4 . IO "9
Fm256 sol. 9 . IO "6 IO "9 insol . 9 . IO "6 6 . IO '10
(e) The note concerning natural thorium shall be replaced by the following :
'By custom, one curie of natural thorium corresponds to :
3-7 . 1010 dis/sec of Th 232 and
3.7 . 1010 dis/sec of Th228.'
Article18¶
In Annex 3 , Table C, the words :
'K = 10 for a continuous exposure (one hundred and sixty-eight hours per week) outside the controlled area'
shall be replaced by the following words :
'K = 10 for a continuous exposure outside the controlled area in the case of persons belonging to the group defined in (c) of the fifth subparagraph of Article 1 (2).'
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Article19¶
Annex 3 , Table D shall be replaced by the following :
'D. Maximum permissible concentration of a mixture of unidentified radionuclidesjn drinking water for continuous exposure of occupationally exposed-persons
Types of mixture MPC in μα/ml .
— Any mixture of alpha, beta, gamma emitters 1 io - 7 — Any mixture of alpha, beta, gamma emitters, if the Ra22® and the Ra228 can be disregarded"' 1 IO -6 —; Any mixture of alpha, beta, gamma emitters, if the Sr90, I129 , Pb210, Ra226, Ra228, U238, U nat. , Cm248 and Çf254 can be disregarded"' 7 IO -6 — Any mixture of alpha, beta, gamma emitters, if the Sr90, 1126, 1129, 1131, Pb210, Po210, At211, Ra223, Ra226, Ra228, Rl228, Pa231, Th nat. , U232, U238, U nat. , Cm248, Cf254 and Fm256 can be disregarded* 2 io - 5 — Any mixture of alpha, beta , gamma emitters , if the Sr90, 1126, 1129, 1131, Pb210, Po210, At211, Ra223 , Ra224, Ra226, Ac227 , Ra228, Th230, U230, Pa231, Th232, Th nat. , U232, U238, U nat. , Cm248, Cf254 and Fm256 can be ' disregarded* 3 IO -5
* " Can be disregarded" implies that the concentration of these radionuclides in water represents only a negligible fraction of the maximum permissible concentration shown in Table A in Annex 3 .'
Article20¶
Annex 3 , Table E shall be replaced by the following :
'E. Maximum permissible concentration of a mixture of unidentified radionuclides in inhaled air for exposure of occupationally exposed persons
Types of mixture" - MPC n [¿Ci/ml
— Any mixture of alpha, beta, gamma emitters .2 . IO "13 — Any mixture of alpha, beta, gamma emitters, if the Pa231, Pu239, Pu240, Pu242, Pu244, Cm248, Cf249 and Cf251 can be disregarded* 7 . IO - 13 — Any mixture of alpha, beta, gamma emitters , if the Ac227 , Th230, Pa231, ~ Pu238, Pu239, Pu240, Pu242, Pu244, Cm248, Cf249 and Cf251 can be disre garded* r . IO -12 . — Any mixture of beta and gamma emitters, if alpha emitters can be disregarded , and if Ac227, Am242 and Cf254 can be disregarded* 1 . IO -11 — Any mixture of beta and gamma emitters, if the alpha emitters can . be disregarded and if Pb210, Ac227 , Ra228, Pu241, Am242m and Cf254 can be disregarded* 1 io - 10 — Any mixture of beta and gamma emitters , if the alpha emitters can be disregarded and if the Sr90, I129, Pb210, Ac227 , Ra228, Pa230, Pu241, Am242111, Bk249, Cf253, Cf254, Es255 and Fm256 can be disregarded;' 1 IO -9
* " Can be disregarded" implies that the concentration of these- radionuclides in the air represents only a negligible fraction . of the maximum permissible concentration shown in Table A in Annex 3 .'
This Directive is addressed to the Member States :
Done at Brussels, 27 October 1966. For the Council The President J. M. A. H. LUNS