RE: Potassium 40 variation in soil

["Lieskovsky, Miro" <MLieskovsky@nbpower.com>]

Bjorn:

Merril Eisenbund and Thomas Gesell, Environmental Radioactivity from
Natural, Industrial, and Military Sources, Fourth Ed., Academic Press, 1997,
p.140
Table 6-6, Ranges and Averages of the Concentrations of 40K, 232Th, and 238U
in Typical Rocks and Soils:

All rock (range) 
K40 (70-1500)Bq/kg
Th232 (7-80)Bq/kg
U238 (7-60)Bq/kg
(Examples of materials outside the ranges can be found, but quantities are
relatively small.)

Miro


-----Original Message-----
From: Bjorn Cedervall [mailto:bcradsafers@hotmail.com]
Sent: November 8, 1999 8:01 PM
To: Multiple recipients of list
Subject: Potassium 40 variation in soil


I have this one number of 400 Bq K-40 per kg in soil. Guess that "soils" can

vary in composition quite a bit. Can anyone give me an idea about the 
natural variation - or give me a hint about some relevant website? (I am 
also interested in values for granite and other major rock types). The same 
question is for Th-232 and U-238. This is for educational purposes - to 
teach people about natural radioactivity. Thank you in advance for any help.

Bjorn Cedervall    bcradsafers@hotmail.com

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