SCHEDULE 7Quantities and concentrations of radionuclides

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