RE: CHEAPEST GM instrument yet!!

["Strickert, Rick" <rstrickert@signaturescience.com>]

	> My question is how does a gm tube measure beta? 



It appears the RD 8901 has some slits on the right side 

of the case where the GM tube is located. Energetic beta 

particles could get through a thin wall GM tube if not 

blocked by the case.  Then the uR/hr reading would 

not be accurate for a gamma exposure measurement.



There is an English manual (of sorts) for the RD 8901 at

http://www.littoclime.com/pdf/manual_uk.pdf



More RD 8901 specifications (in French) are at

http://www.littoclime.com/pdf/RD8901tech.pdf

The dimensions of the Geiger tube are also shown.



Another French site for information is 

http://www.criirad.com/criirad/LABORATOIRE/Quartex/Quartex.Pres.html



For a "James Bond" style geiger counter, check out 

http://www.radjournal.com/articles/Gammawatch/gwatch.htm

or http://www.vigiwatch.com/en/cadre.htm



Rick Strickert

Austin, TX





************************************************************************

You are currently subscribed to the Radsafe mailing list. To unsubscribe,

send an e-mail to Majordomo@list.vanderbilt.edu  Put the text "unsubscribe

radsafe" (no quote marks) in the body of the e-mail, with no subject line.

You can view the Radsafe archives at http://www.vanderbilt.edu/radsafe/