On the elimination of the afterglow of CsI(Tl) scintillation detector

✍ Scribed by Z.B. Alfassi; Y. Ifergan; U. Wengrowicz; Marcelo Weinstein

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 547 KB
• Volume: 606
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2009.05.002

✦ Synopsis

The use of CsI(Tl) in survey meters is limited to low dose-rate fields due to the afterglow effect, which can take up to 20 min in case of 120 s exposure to 4 R/h field. Even mixtures of low and high dose-rate fields are prohibited since the afterglow effect of the high dose-rate field prevents the use of the meter in the low dose-rate field. It was found that heating the scintillation detector to 60 1C shortened considerably the time of the afterglow effect to 3 s, even after exposure of 120 s to fields of 4 R/h. It is suggested to start heating the detector immediately when reaching high dose-rate field and adjusting the calibration to the measured temperature.