The Ionising Radiations Regulations 2017

SCHEDULE 7 E+W+S Quantities and concentrations of radionuclides

Regulations 2(4), 6(2), 31(1), 31(3)and Schedule 1

PART 1 E+W+S 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

Regulations 2(4), 6(2)and Schedule 1

PART 2 E+W+S Table of naturally occurring radionuclides (which are not processed for their radioactive, fissile or fertile properties)

Values for exemption from notification and registration for naturally occurring radionuclides in solid materials (which are not processed for their radioactive, fissile or fertile properties), which apply whether or not the radionuclide is in secular equilibrium with its progeny

1 Potassium salts in quantities less than 1,000kg are exempt.
1	2	3	4
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)
	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)
	(Bq/g)	(Bq)	(Bq/g)
K-401	10	106	102
Rb-87	1	107	104
Pb-210+	1	104	10
Po-210	1	104	10
Ra-226+	1	104	10
Ra-228+	1	105	10
Th-228+	1	104	1
Th-232 sec	1	103	1
U-238 sec	1	103	1
Note Nuclides carrying the suffix “+” in the above table represent parent nuclides and their progeny as listed in the table below. The dose contributions of 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 the Note above

Parent radionuclide	Progeny
Pb-210	Bi-210, Po-210
Ra-226	Rn-222, Po-218, Pb-214, Bi-214, Po-214, Pb-210, Bi-210, Po-210
Ra-228	Ac-228
Th-228	Ra-224, Rn-220, Po-216, Pb-212, Bi-212, Tl-208, Po-212

Regulation 2(4)

PART 3 E+W+S Quantity and concentration ratios for more than one radionuclide

1.  For the purpose of Regulation 2(4)— E+W+S

(a) the quantity ratio for more than one radionuclide is the sum of the quotients of the quantity of a radionuclide present Q_p divided by the quantity of that radionuclide specified in the appropriate entry in Parts 1, 2 or 4 of this Schedule Q_lim, namely—

(b) the concentration ratio for more than one radionuclide is the sum of the quotients of the concentration of a radionuclide present C_p divided by the concentration of that radionuclide specified in the appropriate entry in Parts 1 or 2 of this Schedule C_lim, namely—

2.  In any case where the isotopic composition of a radioactive substance is not known or is only partially known, the quantity or concentration ratio for that substance is to be calculated by using the values specified in the appropriate column in Part 1 of this Schedule for “other radionuclides not listed above” for any radionuclide that has not been identified or where the quantity or concentration of a radionuclide is uncertain, unless the employer can show that the use of some other value is appropriate in the circumstances of a particular case, when the employer may use that value. E+W+S

Regulations 2(1) and 2(4)

PART 4 E+W+S Table of quantities of radioactive material defining high-activity sealed sources

For radionuclides not listed in the table below, the relevant quantity value is the same as the D-value defined in section 2 Table 1 of the IAEA publication: Dangerous quantities of radioactive material (D-values), (EPR-D-VALUES 2006)

1 The activity given is that of the alpha-emitting radionuclide.
Radionuclide	Quantity (Bq)
Co-60	3 × 1010
Se-75	2 × 1011
Sr-90 (Y-90)	1 × 1012
Cs-137	1 × 1011
Pm-147	4 × 1013
Gd-153	1 × 1012
Tm-170	2 × 1013
Yb-169	3 × 1011
Ir-192	8 × 1010
Ra-226	4 × 1010
Pu-238	6 × 1010
Pu-239/Be-91	6 × 1010
Am-241	6 × 1010
Am-241/Be-91	6 × 1010
Cm-244	5 × 1010
Cf-252	2 × 1010