BaSO4 will happily absorb gamma-rays, presumably bumping electrons up into outer orbitals. What happens next?
I assume fluoresence as electrons drop back. Will the BaSO4 be safe to handle immediately after the gamma-rays stop or should I wait a while before using it in a subsequent experiment?
I read in "Sharaf, M.A., & Hassan, Gamal M. (2004). Radiation induced radical in barium sulphate for ESR dosimetry: a preliminary study" that the BaSO4 maintains an ESR signature for a year after getting zapped (!). I want to duplicate exactly this experiment, but I don't want to bring a gamma-ray emitting monster into my lab either.