CELEX: 31966L0045
Language: en
Date: 1966-10-27 00:00:00
Title: Council Directive 66/45/Euratom 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

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
                                                    (66/45/Euratom)
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 ;
Having regard to the proposal from the Commission ;                    and
After consulting the European Parliament1 ;                        — total exposure, which is the sum of external
                                                                       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.
 ---pagebreak---  266                                         Official Journal of the European Communities
                               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 :
                      Radiation                               RBE1
                                                                                                  Article 5
                                                                         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 :
     '§1 — The maximum permissible dose for an                               (c) for exposure of other organs individually, 4 rem
     occupationally exposed person shall be expressed                            per thirteen weeks and 13 rem per year.'
     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
     given age, received by the blood-forming organs                     Article 11 shall be renumbered Article 9 .
     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 .'
 ---pagebreak---                                     Official Journal of the European Communities                                   267
                        Article 10                               Article 14
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
    sidered as average values relating to a period of a          (b) When the dose exceeds 25 rem, Article 25 (3)
    year.
                                                                     shall be applicable.
    § 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
 ---pagebreak---  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.'
    Article 15                                                                            Article 13
               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 :
 ---pagebreak---                                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.'
 ---pagebreak--- 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.'
                                                          Article 16
     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.'
                                                          Article 17
    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)'.
 ---pagebreak---                        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-®
 ---pagebreak--- 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.
 ---pagebreak---                          Official Journal of the European Communities                               273
           Element                                    Form        MPC in water         MPC in air
                                 Radionuclide
       (Atomic number)                                  fa              C                  C
Uranium (Cont'd)
(92)                             U240 + Np240     sol.             3 . IO "4 -        8 . IO "8
                                                  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.'
                                              Article 18
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).'
 ---pagebreak--- 274                             Official Journal of the European Communities
                                                           Article 19
     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 .'
                                                           Article 20
     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 .'
                                                         . Article 21
    This Directive is addressed to the Member States :
    Done at Brussels, 27 October 1966.
                                                                                                           For the Council
                                                                                                            The President
                                                                                                          J. M. A. H. LUNS