Concentrations and their ratio of (222)Rn decay products in rainwater measured by gamma-ray spectrometry using a low-background Ge detector.

The concentrations and the concentration ratios of individual short-lived (222)Rn decay products ((214)Pb and (214)Bi) in rainwater were measured at Kumatori village (34.39 degrees N, 135.35 degrees E, approximately 70 m above sea level) in Osaka, Japan, by gamma-ray spectrometry using a low-background Ge detector.

Statistical image analysis of high-sensitivity neutron images obtained by cooled CCD systems.

Neutron sensitivity and noise characteristics of cooled CCD NR systems were investigated. Eighteen species of neutron sensitive scintillators were tested by the use of two types of cooled CCD devices. The statistical analysis of the S/N ratio of the neutron images showed that the ZnS+LiF type was the highest sensitivity scintillator.