Dear Radsafers,
You help would be greatly appreciated on the following. International (IAEA) Transport regs say (in para 241 (a) (i)):
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
241. Surface contaminated object (SCO) shall mean a solid object which is not itself radioactive but which has radioactive material distributed on its surfaces. SCO shall be in one of two groups:
(a) SCO-I: A solid object on which:
(i) the non-fixed contamination on the accessible surface averaged over 300 cm2 (or the area of the surface if less than 300 cm2) does not exceed 4 Bq/cm2 for beta and gamma emitters and low toxicity alpha emitters, or 0.4 Bq/cm2 for all other alpha emitters; and
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Now, where I’m getting lost is WHAT the ‘low toxicity alpha emitters’… Do we have a list somewhere… ? I am actually after the info which limit would apply for things contaminated with natural thorium, but am interested in the bigger picture as well.
Kind regards
Nick Tsurikov
Eneabba, Western Australia
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