Appendix. What is radiation quality measured by.
Accordingly to Russian Federal
Law, the usage of construction and decoration materials with natural
radionuclides unknown content is prohibited. That means the implementation
of 226Ra, 232Th and 40K radionuclides
content standards. Accordingly to NRB-99 Radiation Safety Standards
and GOST 30108-94 rate setting is executed using specific effective
Aeff = ARa
+ 1.31ATh + 0.085AK,
where ARa, ATh, AK
- specific activities of 226Ra, 232Th and
40K radionuclides accordingly, Bk/kg.
Accordingly to GOST 30108-94 the value for specific
effective activity evaluation and material class establishing
are conducted by following formula:
Aeff m = Aeff+ D,
where D - absolute error of Aeff determination.
- For materials used for newly built dwelling
and public buildings (1 class) Aeff m
must be no more than 370 Bk/kg.
- For materials used for road building within
settlement, long-term building and industrial structures building
(2 class) Aeff m must be no more than
- For materials used for road building off settlements
(3 class) Aeff m must be no more than
- If Aeff m is more than 1500 Bk/kg,
material use possibility coordinated each time by State Sanitary
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