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Time needed for Rn-222 daughters to reach equilibrium with theirparent?

Dear Radsafers - 



How long does it take Radon-222 daughter products to reach equilibrium with their parent, 

assuming one starts with only Radon-222 gas (no daughters yet having begun ingrowth)?



Thanks for any help you can provide.



Steve

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

Steven R. Frey,

   Radiological Control Manager

Stanford Linear Accelerator Center (SLAC)

Room 211, Building 24, Mail Stop 84

2575 Sand Hill Road

Menlo Park, CA 94025

Phone: (650) 926-3839 (office), (650) 926-3030 (fax)

Email: Sfreyohp@SLAC.Stanford.EDU

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





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