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Hi Nick, The Code
of Practice for the Safe Transport of Radioactive Material published by ARPANSA
defines low toxicity alpha emitters in para 227 as: Low
toxicity alpha emitters are: natural uranium; depleted uranium; natural
thorium; uranium-235 or uranium-238; thorium-232; thorium 228 and thorium-230
when contained in ores or physical and chemical concentrates; or alpha emitters
with a half-life of less than ten days. Hope that
helps Kathryn
Taylor -----Original
Message----- 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 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 NOTICE - Mail attachments have been
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