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*To*: RADSAFE@romulus.ehs.uiuc.edu*Subject*: Help with backscatter equation, please*From*: Robert.Morris@rfets.gov (Robert Morris)*Date*: Wed, 15 Apr 1998 17:22:25 -0600

I need to calculate beta backscatter factors for various different substrates. I am attempting to use equations shown in Table 9.16 of the third edition of the Handbook of Health Physics and Radiological Health, but I am having trouble. The equations are from Tabata, Ito, and Okabe, "An empirical equation for the backscattering coefficient of electrons" Nuclear Instruments and Methods 94:509-513;1971. It seems like something is missing from the equations (maybe electron energy?). I would appreciate some help. Question 1. If there is something missing handbook version of the equations, what is the correct version of the equations? Question 2. Is this an appropriate set of equations to calculate the backscatter of a beta source on a substrate of a given Z? Question 3. If not, what is? As always, thanks in advance for the help Robert Morris, CHP, CIH B&W Services SSOC Rocky Flats Environmental Technology Site Golden, CO Robert.Morris@RFETS.gov

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