# The Ionising Radiations Regulations 2017, Part 1: Table of artificial radionuclides and naturally occurring radionuclides (which are processed for their radioactive, fissile or fertile properties)


1 Potassium salts in quantities less than 1,000kg are exempt.
1
2
3
4
5
6
Radionuclide name, symbol, isotope
Concentration for: Notification (any amount of radioactive material); Registration (amounts of radioactive material that exceed 1,000kg)
Quantity for Notification
Concentration for Registration (amounts of radioactive material that do not exceed 1,000kg)
Quantity for notification of occurrences
Quantity for notification of occurrences
Regulation 5(1) and Schedule 1, paragraph 1(a);regulation 6(2)(f)
Regulation 5(1) and Schedule 1, paragraph 1(b)
Regulation 6(2)(e)
Regulation 31(1)
Regulation 31(3)
(Bq/g)
(Bq)
(Bq/g)
(Bq)
(Bq)
Hydrogen
H-3 (tritiated compounds)
102
109
106
1012
1010
Beryllium
Be-7
10
107
103
1012
108
Carbon
C-11
0.01
106
10
1013
107
C-11 (monoxide)
0.01
109
10
1012
1010
C-11 (dioxide)
0.01
109
10
1012
1010
C-14
1
107
104
1011
108
Oxygen
O-15
0.01
109
102
1010
Fluorine
F-18
10
106
10
1013
107
Sodium
Na-22
0.1
106
10
1010
107
Na-24
0.1
105
10
1011
106
Silicon
Si-31
103
106
103
1013
107
Phosphorus
P-32
103
105
103
1010
106
P-33
103
108
105
1011
109
Sulphur
S-35
102
108
105
1011
109
Chlorine
Cl-36
1
106
104
1010
107
Cl-38
10
105
10
1013
106
Argon
Ar-37
0.01
108
106
1013
Ar-41
0.01
109
102
109
Potassium
K-401
1
106
102
1010
107
K-42
102
106
102
1012
107
K-43
10
106
10
1011
107
Calcium
Ca-45
102
107
104
1010
108
Ca-47
10
106
10
1011
107
Scandium
Sc-46
0.1
106
10
1010
107
Sc-47
102
106
102
1011
107
Sc-48
1
105
10
1011
106
Vanadium
V-48
1
105
10
1010
106
Chromium
Cr-51
102
107
103
1012
108
Manganese
Mn-51
10
105
10
1013
106
Mn-52
1
105
10
1010
106
Mn-52m
10
105
10
1013
106
Mn-53
102
109
104
1012
1010
Mn-54
0.1
106
10
1011
107
Mn-56
10
105
10
1012
106
Iron
Fe-52+
10
106
10
1012
107
Fe-55
103
106
104
1011
107
Fe-59
1
106
10
1010
107
Cobalt
Co-55
10
106
10
1011
107
Co-56
0.1
105
10
1010
106
Co-57
1
106
102
1011
107
Co-58
1
106
10
1010
107
Co-58m
104
107
104
1013
108
Co-60
0.1
105
10
1010
106
Co-60m
103
106
103
1016
107
Co-61
102
106
102
1013
107
Co-62m
10
105
10
1013
106
Nickel
Ni-59
102
108
104
1011
109
Ni-63
102
108
105
1011
109
Ni-65
10
106
10
1013
107
Copper
Cu-64
102
106
102
1012
107
Zinc
Zn-65
0.1
106
10
1010
107
Zn-69
103
106
104
1014
107
Zn-69m+
10
106
102
1012
107
Gallium
Ga-68
0.01
105
10
1013
106
Ga-72
10
105
10
1011
106
Germanium
Ge-68+
0.01
105
10
1010
106
Ge-71
104
108
104
1013
109
Arsenic
As-73
103
107
103
1011
108
As-74
10
106
10
1011
107
As-76
10
105
102
1011
106
As-77
103
106
103
1012
107
Selenium
Se-75
1
106
102
1011
107
Bromine
Br-82
1
106
10
1011
107
Krypton
Kr-74
0.01
109
102
109
Kr-76
0.01
109
102
1010
Kr-77
0.01
109
102
109
Kr-79
0.01
105
103
1010
Kr-81
0.01
107
104
1011
Kr-83m
0.01
1012
105
1012
Kr-85
0.01
104
105
1012
Kr-85m
0.01
1010
103
1010
Kr-87
0.01
109
102
109
Kr-88
0.01
109
102
109
Rubidium
Rb-86
102
105
102
1011
106
Strontium
Sr-85
1
106
102
1011
107
Sr-85m
102
107
102
1013
108
Sr-87m
102
106
102
1013
107
Sr-89
103
106
103
1010
107
Sr-90+
1
104
102
109
105
Sr-91+
10
105
10
1012
106
Sr-92
10
106
10
1012
107
Yttrium
Y-90
103
105
103
1011
106
Y-91
102
106
103
1010
107
Y-91m
102
106
102
1013
107
Y-92
102
105
102
1012
106
Y-93
102
105
102
1012
106
Zirconium
Zr-93+
10
107
103
109
108
Zr-95+
1
106
10
1010
107
Zr-97+
10
105
10
1011
106
Niobium
Nb-93m
10
107
104
1011
108
Nb-94
0.1
106
10
109
107
Nb-95
1
106
10
1011
107
Nb-97+
10
106
10
1013
107
Nb-98
10
105
10
1013
106
Molybdenum
Mo-90
10
106
10
1012
107
Mo-93
10
108
103
1011
109
Mo-99+
10
106
102
1011
107
Mo-101+
10
106
10
1013
107
Technetium
Tc-96
1
106
10
1011
107
Tc-96m
103
107
103
1014
108
Tc-97
10
108
103
1012
109
Tc-97m
102
107
103
1010
108
Tc-99
1
107
104
1010
108
Tc-99m
102
107
102
1013
108
Ruthenium
Ru-97
10
107
102
1012
108
Ru-103+
1
106
102
1010
107
Ru-105+
10
106
10
1012
107
Ru-106+
0.1
105
102
109
106
Rhodium
Rh-103m
104
108
104
1015
109
Rh-105
102
107
102
1012
108
Palladium
Pd-103+
103
108
103
1011
109
Pd-109+
102
106
103
1012
107
Silver
Ag-105
1
106
102
1011
107
Ag-108m+
0.1
106
10
1010
107
Ag-110m+
0.1
106
10
1010
107
Ag-111
102
106
103
1011
107
Cadmium
Cd-109+
1
106
104
1010
107
Cd-115+
10
106
102
1011
107
Cd-115m+
102
106
103
1010
107
Indium
In-111
10
106
102
1011
107
In-113m
102
106
102
1013
107
In-114m+
10
106
102
1010
107
In-115m
102
106
102
1013
107
Tin
Sn-113+
1
107
103
1011
108
Sn-125
10
105
102
1010
106
Antimony
Sb-122
10
104
102
1011
105
Sb-124
1
106
10
1010
107
Sb-125+
0.1
106
102
1010
107
Tellurium
Te-123m
1
107
102
1010
108
Te-125m
103
107
103
1010
108
Te-127
103
106
103
1012
107
Te-127m+
10
107
103
1010
108
Te-129
102
106
102
1014
107
Te-129m+
10
106
103
1010
107
Te-131
102
105
102
1014
106
Te-131m+
10
106
10
1011
107
Te-132+
1
107
102
1011
108
Te-133
10
105
10
1014
106
Te-133m
10
105
10
1013
106
Te-134
10
106
10
1013
107
Iodine
I-123
102
107
102
1012
108
I-125
102
106
103
1010
107
I-126
10
106
102
1010
107
I-129
0.01
105
102
109
106
I-130
10
106
10
1011
107
I-131
10
106
102
1010
107
I-132
10
105
10
1012
106
I-133
10
106
10
1011
107
I-134
10
105
10
1013
106
I-135
10
106
10
1012
107
Xenon
Xe-131m
0.01
104
104
1011
Xe-133
0.01
104
103
1011
Xe-135
0.01
1010
103
1010
Caesium
Cs-129
10
105
102
1012
106
Cs-131
103
106
103
1012
107
Cs-132
10
105
10
1011
106
Cs-134
0.1
104
10
1010
105
Cs-134m
103
105
103
1014
106
Cs-135
102
107
104
1011
108
Cs-136
1
105
10
1010
106
Cs-137+
0.1
104
10
1010
105
Cs-138
10
104
10
1013
105
Barium
Ba-131
10
106
102
1011
107
Ba-140+
1
105
10
1011
106
Lanthanum
La-140
1
105
10
1011
106
Cerium
Ce-139
1
106
102
1011
107
Ce-141
102
107
102
1010
108
Ce-143
10
106
102
1011
107
Ce-144+
10
105
102
109
106
Praseodymium
Pr-142
102
105
102
1012
106
Pr-143
103
106
104
1011
107
Neodymium
Nd-147
102
106
102
1011
107
Nd-149
102
106
102
1013
107
Promethium
Pm-147
103
107
104
1010
108
Pm-149
103
106
103
1011
107
Samarium
Sm-151
103
108
104
1010
109
Sm-153
102
106
102
1011
107
Europium
Eu-152
0.1
106
10
109
107
Eu-152m
102
106
102
1012
107
Eu-154
0.1
106
10
109
107
Eu-155
1
107
102
1010
108
Gadolinium
Gd-153
10
107
102
1010
108
Gd-159
102
106
103
1012
107
Terbium
Tb-160
1
106
1
1010
107
Dysprosium
Dy-165
103
106
103
1013
107
Dy-166
102
106
103
1011
107
Holmium
Ho-166
102
105
103
1011
106
Erbium
Er-169
103
107
104
1011
108
Er-171
102
106
102
1012
107
Thulium
Tm-170
102
106
103
1010
107
Tm-171
103
108
104
1011
109
Ytterbium
Yb-175
102
107
103
1011
108
Lutetium
Lu-177
102
107
103
1011
108
Hafnium
Hf-181
1
106
10
1010
107
Tantalum
Ta-182
0.1
104
10
1010
105
Tungsten
W-181
10
107
103
1012
108
W-185
103
107
104
1011
108
W-187
10
106
102
1012
107
Rhenium
Re-186
103
106
103
1011
107
Re-188
102
105
102
1012
106
Osmium
Os-185
1
106
10
1011
107
Os-191
102
107
102
1011
108
Os-191m
103
107
103
1012
108
Os-193
102
106
102
1011
107
Iridium
Ir-190
1
106
10
1010
107
Ir-192
1
104
10
1010
105
Ir-194
102
105
102
1011
106
Platinum
Pt-191
10
106
102
1011
107
Pt-193m
103
107
103
1012
108
Pt-197
10
106
103
1012
107
Pt-197m
102
106
102
1014
107
Gold
Au-198
10
106
102
1011
107
Au-199
102
106
102
1011
107
Mercury
Hg-197
102
107
102
1012
108
Hg-197m
102
106
102
1012
107
Hg-203
10
105
102
1011
106
Thallium
Tl-200
10
106
10
1011
107
Tl-201
102
106
102
1012
107
Tl-202
10
106
102
1011
107
Tl-204
1
104
104
1011
105
Lead
Pb-203
10
106
102
1012
107
Pb-210+
0.01
104
10
108
105
Pb-212+
1
105
10
1010
106
Bismuth
Bi-206
1
105
10
1010
106
Bi-207
0.1
106
10
1010
107
Bi-210
10
106
103
109
107
Bi-212+
1
105
10
1011
106
Polonium
Po-203
10
106
10
1013
107
Po-205
10
106
10
1012
107
Po-207
10
106
10
1012
107
Po-210
0.01
104
10
107
105
Astatine
At-211
103
107
103
1010
108
Radon
Rn-220+
0.01
107
104
108
108
Rn-222+
0.01
108
10
109
109
Radium
Ra-223+
1
105
102
107
106
Ra-224+
1
105
10
108
106
Ra-225
10
105
102
107
106
Ra-226+
0.01
104
10
107
105
Ra-227
102
106
102
1013
107
Ra-228+
0.01
105
10
108
106
Actinium
Ac-228
1
106
10
1010
107
Thorium
Th-226+
103
107
103
1011
108
Th-227
1
104
10
107
105
Th-228+
0.1
104
1
106
105
Th-229+
0.1
103
1
106
104
Th-230
0.1
104
1
106
105
Th-231
102
107
103
1012
108
Th-232
0.01
104
10
106
105
Th-234+
10
105
103
1010
106
Protactinium
Pa-230
10
106
10
108
107
Pa-231
0.01
103
1
106
104
Pa-233
10
107
102
1010
108
Uranium
U-230+
10
105
10
107
106
U-231
102
107
102
1011
108
U-232+
0.1
103
1
106
104
U-233
1
104
10
107
105
U-234
1
104
10
107
105
U-235+
1
104
10
107
105
U-236
10
104
10
107
105
U-237
102
106
102
1011
107
U-238+
1
104
10
107
105
U-239
102
106
102
1014
107
U-240
0.01
107
103
1012
108
U-240+
102
106
10
1011
107
Neptunium
Np-237+
1
103
1
107
104
Np-239
102
107
102
1011
108
Np-240
10
106
10
1013
107
Plutonium
Pu-234
102
107
102
1010
108
Pu-235
102
107
102
1014
108
Pu-236
1
104
10
107
105
Pu-237
102
107
103
1011
108
Pu-238
0.1
104
1
106
105
Pu-239
0.1
104
1
106
105
Pu-240
0.1
103
1
106
104
Pu-241
10
105
102
108
106
Pu-242
0.1
104
1
106
105
Pu-243
103
107
103
1013
108
Pu-244+
0.1
104
1
106
105
Americium
Am-241
0.1
104
1
106
105
Am-242
103
106
103
1010
107
Am-242m+
0.1
104
1
106
105
Am-243+
0.1
103
1
106
104
Curium
Cm-242
10
105
102
107
106
Cm-243
1
104
1
107
105
Cm-244
1
104
10
107
105
Cm-245
0.1
103
1
106
104
Cm-246
0.1
103
1
106
104
Cm-247+
0.1
104
1
106
105
Cm-248
0.1
103
1
106
104
Berkelium
Bk-249
102
106
103
109
107
Californium
Cf-246
103
106
103
109
107
Cf-248
1
104
10
107
105
Cf-249
0.1
103
1
106
104
Cf-250
1
104
10
106
105
Cf-251
0.1
103
1
106
104
Cf-252
1
104
10
107
105
Cf-253
102
105
102
108
106
Cf-254
1
103
1
107
104
Einsteinium
Es-253
102
105
102
108
106
Es-254+
0.1
104
10
107
105
Es-254m+
10
106
102
109
107
Fermium
Fm-254
104
107
104
1010
108
Fm-255
102
106
103
109
107
Other radionuclides not listed above (see Note 1)
0.01
103
0.1
105
104
Note 1
In the case of radionuclides not specified elsewhere in this Part, the quantities specified in this entry are to be used unless the Executive has approved some other quantity for that radionuclide.
Note 2
Nuclides carrying the suffix “+” in the above table represent parent nuclides and their progeny as listed in the table below. The dose contributions for those progeny are taken into account in the dose calculation (thus requiring only the exemption level of the parent radionuclide to be considered).
List of parent nuclides and their progeny as referred to in Note 2 above
Parent radionuclide
Progeny
Fe-52
Mn-52m
Zn-69m
Zn-69
Ge-68
Ga-68
Sr-90
Y-90
Sr-91
Y-91m
Zr-93
Nb-93m
Zr-95
Nb-95
Zr-97
Nb-97m, Nb-97
Nb-97
Nb-97m
Mo-99
Tc-99m
Mo-101
Tc-101
Ru-103
Rh-103m
Ru-105
Rh-105m
Ru-106
Rh-106
Pd-103
Rh-103m
Pd-109
Ag-109m
Ag-108m
Ag-108
Ag-110m
Ag-110
Cd-109
Ag-109m
Cd-115
In-115m
Cd-115m
In-115m
In-114m
In-114
Sn-113
In-113m
Sb-125
Te-125m
Te-127m
Te-127
Te-129m
Te-129
Te-131m
Te-131
Te-132
I-132
Cs-137
Ba-137m
Ba-140
La-140
Ce-144
Pr-144, Pr-144m
Pb-210
Bi-210, Po-210
Pb-212
Bi-212, Tl-208, Po-212
Bi-212
Tl-208, Po-212
Rn-220
Po-216
Rn-222
Po-218, Pb-214, Bi-214, Po-214
Ra-223
Rn-219, Po-215, Pb-211, Bi-211, Tl-207
Ra-224
Rn-220, Po-216, Pb-212, Bi-212, Tl-208, Po-212
Ra-226
Rn-222, Po-218, Pb-214, Bi-214, Po-214, Pb-210, Bi-210, Po-210
Ra-228
Ac-228
Th-226
Ra-222, Rn-218, Po-214
Th-228
Ra-224, Rn-220, Po-216, Pb-212, Bi-212, Tl-208, Po-212
Th-229
Ra-225, Ac-225, Fr-221, At-217, Bi-213, Po-213, Pb-209
Th-234
Pa-234m
U-230
Th-226, Ra-222, Rn-218, Po-214
U-232
Th-228, Ra-224, Rn-220, Po-216, Pb-212, Bi-212, Tl-208, Po-212
U-235
Th-231
U-238
Th-234, Pa-234m
U-240
Np-240m, Np-240
Np-237
Pa-233
Pu-244
U-240, Np-240m, Np-240
Am-242m
Am-242, Np-238
Am-243
Np-239
Cm-247
Pu-243
Es-254
Bk-250
Es-254m
Fm-254

---
Source: https://www.legislation.gov.uk/uksi/2017/1075/schedule/7/part/1 (the official version)
Page: https://openlegislation.uk/ionising-radiations-regulations-2017/schedule-7/part-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.