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The Ionising Radiations Regulations (Northern Ireland) 2017

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

PART 2Table 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

1234
Radionuclide name, symbol, isotopeConcentration for: Notification (any amount of radioactive material); Registration (amounts of radioactive material that exceed 1,000kg)Quantity for NotificationConcentration 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)
(1)

Potassium salts in quantities less than 1,000kg are exempt.

K-40(1)10106102
Rb-871107104
Pb-210+110410
Po-210110410
Ra-226+110410
Ra-228+110510
Th-228+11041
Th-232 sec11031
U-238 sec11031

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

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