Re: training -Reply

[Chris Davey <cdavey@med.phys.ualberta.ca>]

In Canada, the Atomic Energy Control Board has just issued a consultative 
document called "C-123 Radioisotope Release Concentrations".  This 
document is out for public comment, and will be made into a regulatory 
document in due course, unless it is modified or cancelled entirely.

Here are some examples of limits, showing the current limits and the new 
(proposed) limits:

				Releases to:

Atmosphere (A),  in Bq per cubic metre
Liquid (L), in Bq per Litre
Solid (S), in Bq per Kilogram
(Note that 37000 Bq is 1 microcurie).

Isotope	Old Limits					New Limits
	  A	L	S			A	L	  S

C-14	3700	37000	3700000			5	9	  200
H-3	37000	370000	37000000		2000	300000	  80000
I-125	37	370	37000			0.04	200	  2
I-131	37	370	37000			0.03	200	  1
P-32	370	3700	370000			0.8	1	  30
S-35	370	3700	370000			4	800	  200
Tc99m   3700	37000	3700000			1000	40000000  40000

This is just a small (representative) sample of the changes proposed.
 
I'm looking for comments (printable!), suggestions on how to improve this 
document and also for information on the limits in the USA, currently, 
together with any impending or proposed changes.  As you will note, the 
proposed new Canadian limits are much, much more restrictive than the 
current ones.

Thanks in advance,

Chris Davey, RSO
Cross Cancer Institute
11560 University Avenue
Edmonton, Alberta
Canada, T6G 1Z2
(403) 492-7477
email: cdavey@med.phys.ualberta.ca