The alpha and beta emitter measurement system in INER

Wuu, Jyi-Lan; Yuan, Ming-Chen; Su, Shi-Hwa; Hwang, Wen-Song

doi:10.1016/s0969-8043(01)00197-x

Cited by 10 publications

(3 citation statements)

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“…Characterization of the MWPC using 90 Sr/ 90 Y coated sources of known activity was carried out. Counting plateau with anode bias shows a stable plateau length of 450 V and well comparable and in some cases better than the values mentioned in the literature [2][3][4][5][6]. It may be due to the geometric perfection and precautions for maintaining gas purity by introducing additional evacuation stage.…”

Section: Resultssupporting

confidence: 64%

“…As per the international regulations [1] (ISO 1988), calibration of contamination monitor needs a minimum active source area of 100 cm 2 . Standard laboratories worldwide use gas flow-type large proportional counters to determine absolute surface emission rates from the large-areacoated α-β sources [2][3][4][5][6]. Extended source is introduced directly within the detection volume of the detector to avoid any loss of detection efficiency due to absorption in the entrance window.…”

Section: Introductionmentioning

confidence: 99%

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2π proportional counting chamber for large-area-coated β sources

Desai

2016

Pramana - J Phys

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Detection system for measuring absolute emission rate from large-area-coated β sources has been indigenously developed. The system consists of a multiwire-based proportional counter with gas flow and a source mounted within the sensitive volume of the detector. Design of the counter enables efficient counting of emissions in 2π solid angle. A provision is made for change of the source and immediate measurement of source activity. These sources are used to calibrate the efficiency of contamination monitors at radiological facilities. Sensitive area of the detector covers 165 • solid angle nearing 2π of emission from the source of size 100 × 150 mm. Performance of the chamber is tested using collimated 55 Fe X-ray source and 90 Sr / 90 Y coated β sources of various activities. The activity measurement system is established as a national primary standard for calibration of coated β sources at Radiological Laboratory at BARC. Design and performance of the chamber are presented.

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Section: Resultssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%