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



Bill,

You wrote: "See the "IATA Dangerous Goods Regulations - 2003 Edition," State Variation USG-10." - Could you please inform the page where you found your information?

I can inform my IAEA reference:

Radioactive material

1 - Material designated in national law or by a regulatory body as being subject to regulatory control because of its  radioactivity;

2 - Any material containing radionuclides where both the activity concentration and the total activity in the consignment  exceed the values specified in paras 401–406. (ST1)

Because 2, countries who follow  the IAEA ST1 should to consider  that  radioactive material requires that the material has both an activity concentration and total activity in the consignment which exceed the values listed in the A tables. This means you can have a material with an activity concentration greater than that listed, but less total activity in the consignment and are now considered non-radioactive.

Because 1. If you have a shipment of Tc99, which under the ST1 has an activity concentration for exempt material of 10,000 Bq/g, you will still be regulated at 70 Bq/g (or 100 Bq/g) if your country has such figure to define radioactive material.

 Finally  the reason for 2, were  developed of transport-specific scenarios which reflected various exposure situations (exposure times, distances, source geometries, etc.). Based on these scenarios, both activity concentration and total activity values were calculated which would result in meeting the 10 microsievert per year value. These transport derived values were comparable to the exemption values in the BSS and resulted in recommended activity concentrations ranging from 1 to 106 Bq/g.

Now as merely curiosity why the 70 Bq/g was selected?

Jose Julio Rozental
joseroze@netvision.net.il

----- Original Message -----

Sent: Monday, June 23, 2003 2:25 PM
Subject: Re: Iternat.transport regs - WHAT's 'low toxicity'?

For U.S. shipments, a package is considered radioactive if it exceeds EITHER limit.  See the "IATA Dangerous Goods Regulations - 2003 Edition," State Variation USG-10.

The opinions expressed re strictly mine.
It's not about dose, it's about trust.
Curies forever.

Bill Lipton
liptonw@dteenergy.com
 

Jose Julio Rozental wrote:

The previous exemption limit of 70Bq/g exempted very little and with many carriers, including the Post Office, not accepting anything that was 'radioactive', and with others making high charges and additional paperwork for dealing with excepted packages. The new exemption limits taken from the BSS are based upon the toxicity of the isotope and are therefore much more realistic for the low toxicity isotopes used in university research. For example the exemption limits for C-14 are 10kBq/g (concentration limit) and 10MBq overall limit. It is only when both these limits are exceeded that a package will be considered radioactive and come within the scope of the regulations
----- Original Message -----
Sent: Sunday, June 22, 2003 6:27 AM
Subject: Re: Iternat.transport regs - WHAT's 'low toxicity'?
 "Low toxicity" appears to mean very low specific activity.

Ruth

Ruth Weiner, Ph. D.
ruthweiner@aol.com