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    Photon buildup in shielding

    Who do you believe? I'm doing some shielding calcs for Cs-137 (662 KeV gamma) in stainless steel (Fe seems close enough) with ux (mfp) in the range of 5 to 15. Shultis and Faw in Radiation Shielding (2000) treat Photon buildup pretty well. Their coefficients for the Berger...
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    Ba-133 neutron capture

    Anybody have good values and a source for thermal neutron capture cross section for Ba-133, both ground and excited states? CRC Handbook gives 4 barns, but wanted to verify it. Thanks.