Radsafers, Found a few Westinghouse lightening arrestors that read about 400 uR/hr on an ion chamber and maximally 2000 cpm on a 44-9 G-M. Anyone have an idea about what isotope may be inside of them? Picture Links: http://tinypic.com/r/21b9068/5 http://tinypic.com/r/zxp2xx/5 Rich Wagner