----- Original Message -----
Sent: Friday, June 20, 2003 3:55 AM
Subject: 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
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
http://eneabba.net/
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