Vietnam: Classification of radioactive material with low specific activity

Specifically, according to Article 8 of Circular No. 23/2012/TT-BKHCN of the Ministry of Science and Technology of Vietnam, radioactive material with low specific activity include: LSA-I, LSA-II and LSA-III.

LSA-I includes:

- Uranium ores, thorium ores or their crystallized ores and other ores containing natural the radionuclide(s) used in order to produce these the radionuclide(s);

- Natural uranium, depleted uranium, natural thorium, their compounds or mixtures in condition that they have not yet been irradiated and being in solid or liquid form;

- Radioactive material which its A2 value is not be limited, except fissile material not be exempted as specified in clause 1 Article 12 of this Circular;

- Other radioactive material which their activities are dispersed uniformly and their average specific activities not exceed 30 times of activity concentration value specified in column 4 table 1 and column 4 table 2 TCVN 6867-1:2001, except fissile material not be exempted as specified in clause 1 Article 12 of this Circular.

LSA-II includes:

- Water with tritium concentration of up to 0.8 (TBq/L);

- Other radioactive material which their activities are dispersed uniformly and their average specific activities not exceed 10-4 A2 (TBq/g) for solid, gas and 10-5 A2 (TBq/g) for liquid.

LSA-III includes:

- Radioactive material which are dispersed in solid or radioactive material which are dispersed in solidified agents (such as concrete, asphalt, porcelain, etc); 

- The slightly-soluble radioactive material or radioactive material contained in slightly-soluble packagings and in case of packaging loss, radioactive material diminished when soaked in water for 7 days shall not exceed  0.1 A2 (TBq);

- Solid radioactive material with average specific activity (not including shielding material) not exceeding 2 x 10-3 A2 (TBq/g). 

View more details at Circular No. 23/2012/TT-BKHCN of the Ministry of Science and Technology of Vietnam, effective from January 21, 2013.

Le Vy

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