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Iternat.transport regs - WHAT's 'low toxicity'?



Title: Iternat.transport regs - WHAT's 'low toxicity'?

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

<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Now, where Im 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

http://eneabba.net/

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