Development of a compact lanthanoid bromide -ray spectroscopy system with high-count-rate pulse processing and simultaneous pulse-current operation mode for in-situ non-destructive assay

Kaburagi, Masaaki   ; Ishii, Junya*; Kato, Masahiro*; Kamada, Kei*; Yoshino, Masano*; Shimazoe, Kenji*

A new -ray spectroscopy system designed for use in intense -ray fields was developed. The relative energy resolution was 3.6 at 662 keV at dose rates of up to 2.89 Gyh in a Cs -ray field and was 4.3 at 1333 keV at dose rates of up to 4.17 Gy h in a Co -ray field without the need for heavy-metal radiation shielding. Furthermore, a 4.38 MBq sealed Co source was measured under the background -ray irradiation by a Cs source. Although the geometry between the detector and Co source was fixed, the background -ray dose rate (intensity) varied. The identification and quantification of the Co source was unaffected at irradiation dose rates of up to 1.04 Gy h.