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Thorium X-Rays from U-238

Can anybody tell me why the list of radiation from U-238 says "Th L X-Rays"

instead of just "Th X-Rays".  This is from the old [1970] Rad Health

handbook.  I don't see why both K and L shell electrons should not be self

ionized by alpha particles.  I looked through the isotopes of U and it seems

many of the even mass number isotopes say "Th L X-Rays" if they are alpha

emitters and many of the odd mass numbered isotopes say "Th X-Rays".

Any opinions in this e-mail are solely those of the author, and are not

represented as those of the VA Eastern Colorado HCS, the Dept. of Veterans

Affairs, or the US Government.

Peter G. Vernig, Radiation Safety Officer, VA Eastern Colorado Health Care

System, 1055 Clermont St. Denver, CO 80220, peter.vernig@med.va.gov, Phone=

303.399.8020 x2447; Fax = 303.393.5026, alternate fax, 303.393.5248

"...whatever is true, whatever is noble, whatever is lovely, whatever is

admirable, if anything is found to be excellent or praiseworthy, let your

mind dwell on these things."

Paul of Tarsus


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