http://www.legislation.gov.uk/id/uksi/2017/1075

SCHEDULE 7Quantities and concentrations of radionuclides

PART 1Table of artificial radionuclides and naturally occurring radionuclides (which are processed for their radioactive, fissile or fertile properties)

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

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-40(1)	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).
(1) Potassium salts in quantities less than 1,000kg are exempt.

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

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

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

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	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-40(1)	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).
(1) Potassium salts in quantities less than 1,000kg are exempt.

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

PART 3Quantity and concentration ratios for more than one radionuclide

Regulation 2(4)

1

For the purpose of Regulation 2(4)—

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_pdivided 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.

PART 4Table of quantities of radioactive material defining high-activity sealed sources

Regulations 2(1) and 2(4)

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)

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-9(*)	6 × 10¹⁰
Am-241	6 × 10¹⁰
Am-241/Be-9(*)	6 × 10¹⁰
Cm-244	5 × 10¹⁰
Cf-252	2 × 10¹⁰
(*) The activity given is that of the alpha-emitting radionuclide.