Development of Low Radioactive Molecular Sieves for Ultra-Low Background Particle Physics Experiment
Abstract
This study develops low radioactive molecular sieves (MS) for ultra-low background particle physics experiment. The manufactured MS is of type 4A. 226Ra and 232Th have concentrations of about 57 and 198 mBq/kg, respectively, measured by applying high-purity germanium (HPGe) measurement. The reduction of the radioactivity from the commercial one is about 99 and 97 percent for 226Ra and 232Th, respectively. Furthermore, the radon emanation rate from MS filter is about 2.1 mBq, which is measured by utilizing pin-photo type radon detector. This developed MS is expected to remove the impurity from the noble gas, in which low radioactivity is needed such as dark matter search experiment.
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