Vietnam: The surface contaminated objects include SCO-I and SCO-II

Specifically, according to Article 9 of Circular No. 23/2012/TT-BKHCN of the Ministry of Science and Technology of Vietnam, the surface contaminated objects include SCO-I and SCO-II.   

SCO-I is a solid with the following characteristics:

- The removable contamination on an accessible surface, for average on area of 300 (cm2) (or the total area of the surface if less than 300 (cm2)) that does not exceed 4 (Bq/cm2) for beta and gamma emitters and low hazardous alpha emitters, or does not exceed 0.4 (Bq/cm2) for the other alpha emitters;

- The fixed contamination on the accessible surface for average on area of 300 (cm2) (or the total area of the surface of less than 300 (cm2)) that does not exceed 4 x 104 (Bq/cm2) for beta and gamma emitters and low hazardous alpha emitters, or does not exceed 4 x 103 (Bq/cm2) for the other alpha emitters;

- The removable contamination and the fixed contamination on the inaccessible surface, for average on area of 300 (cm2) (or the total area of the surface of less than 300 (cm2)) that does not exceed 4 x 104 (Bq/cm2) for beta and gamma emitters and low hazardous alpha emitters, or 4 x 103 (Bq/cm2) for the other alpha emitters.

SCO-II is a solid that may be the fixed or removable contamination on the surface exceeds the limits specified for SCO-I and having the following additional characteristics:

- The removable contamination on an accessible surface, for average on area of 300 (cm2) (or the total area of the surface if less than 300 (cm2)) that does not exceed 400 (Bq/cm2) for beta and gamma emitters and low hazardous alpha emitters, or does not exceed 40 (Bq/cm2) for the other alpha emitters;

- The fixed contamination on the accessible surface for average on area of 300 (cm2) (or the total area of the surface of less than 300 (cm2)) that does not exceed 8 x 105 (Bq/cm2) for beta and gamma emitters and low hazardous alpha emitters, or does not exceed 8 x 104 (Bq/cm2) for the other alpha emitters;

- The removable contamination and the fixed contamination on the inaccessible surface, for average on area of 300 (cm2) (or the total area of the surface of less than 300 (cm2)) that does not exceed 8 x 105 (Bq/cm2) for beta and gamma emitters and low hazardous alpha emitters, or does not exceed 8 x 104 (Bq/cm2) for the other alpha emitters.

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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