Upgrades of DARWIN; A Dose and spectrum monitoring system applicable to various types of radiation over wide energy ranges

Sato, Tatsuhiko   ; Satoh, Daiki   ; Endo, Akira   ; Shigyo, Nobuhiro*; Watanabe, Fusao*; Sakurai, Hiroki*; Arai, Yoichi*

A dose and spectrum monitoring system applicable to neutrons, photons and muons over wide ranges of energy, designated as DARWIN, has been developed for radiological protection in high-energy accelerator facilities. The performance of the upgraded DARWIN was examined in various radiation fields, including an operational field in J-PARC. The experiments revealed that the dose rates and spectra measured by the upgraded DARWIN are quite reasonable, even in radiation fields with peak structures in terms of both spectrum and time variation. These results clearly demonstrate the usefulness of DARWIN for improving radiation safety in high-energy accelerator facilities.