[ RadSafe ] Half-lives (UNCLASSIFIED)

[Falo, Gerald A Dr USACHPPM]

Classification:  UNCLASSIFIED 
Caveats: NONE

Steven and All,

My Chart of the Nuclides (16th, Edition, 2002) uses color codes based on
tens:

None/White =  <1day
Orange =  1 day to 10 days
Yellow =  >10 days to 100 days
Green =   >100 days to 10 years
Blue =  >10 years to 5E8 years
Gray =  >5E8 years or stable

I didn'y see a rationale for these choices.

Jerry

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
Behalf Of Steven Dapra
Sent: Friday, September 19, 2008 7:05 PM
To: radsafe at radlab.nl
Subject: [ RadSafe ] Half-lives

Sept. 19, 2008

	Is there a convention for dividing half-lives into groups for
very long (such as U-238), long, medium, short, and very short?  If
there is, what are the dividing points for the various lengths of time?

Steven Dapra
sjd at swcp.com

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Classification:  UNCLASSIFIED 
Caveats: NONE