活性炭添着ウレタンフォームを用いる均一な¹²⁵I面線源の作成方法

抄録

Uniform ₁₂₅I disk sources were prepared as a reference source to calibrate NaI (Tl) scintillation detector to measure ¹²⁵I activity on a filter of air monitor in a laboratory. The base of the disk source was a charcoal activated polyurethane foam rubber mat of 75mm in diameter, 2mm in thicknes. ₁₂₅I disk sources of approximate 0.5kBq, 1kBq, and 10kBq were obtained through immersing disks in ethanol solution containing Na¹²⁵I of 0.5kBq/ml, 1kBq/ml and 10kBq/ml, respectively, and then drying up them. The uniformity of the distribution of ₁₂₅I on the disk source was estimated by analyzing the autoradiograph of the disk source using an imaging analyzer. The radioactivity of ¹²⁵I was distributed uniformly on the surface of the disk source within an uncertainty of about 10%.