NDLI: Development of a flow-cell alpha detector utilizing microencapsulated CsI:Tl granules and silicon PIN-photodiodes

Content Provider	IEEE Xplore Digital Library
Author	Hui Tan DeVol, T.A.
Copyright Year	2002
Description	Author affiliation: Dept. of Environ. Eng. & Sci., Clemson Univ., SC, USA (Hui Tan; DeVol, T.A.)
Abstract	A flow-cell detector was developed utilizing microencapsulated granular CsI:Tl and Si PIN-photodiode for gross alpha radiation quantification. The CsI:Tl scintillator was crushed and sieved to 63-90 and 90-125 /spl mu/m particle size and encapsulated with 10% (ratio of coating layer mass to particle mass) of Parylene C polymer. The radiation detector consisted of a CsI:Tl flow-cell and two silicon PIN-photodiodes (PDs). Signals from the PDs were processed by charge sensitive preamplifiers and shaping amplifiers then digitized by a GaGe CompuScope 8012A/PCI 12-bit dual channel 50-MHz digital oscilloscope card residing in a Pentium III 450 MHz PC. The digitized signal was processed by a LabVIEW-based data acquisition program for pulse height and pulse shape analyses in conjunction with a software-realized coincidence mode with a resolving time of 800 ns. By setting an appropriate region of interest (ROI) for alpha events in a dual parameter histogram, the spillover of beta events into alpha ROI was less than 0.03%. The detection efficiency for /sup 233/U was about 10% in the first several hours and declined with time due to aqueous solution diffusing through the microencapsulant. The long component of detection efficiency "half-life" for 63-90 and 90-125 /spl mu/m CsI:Tl granules was measured to be 36 hours when 1000 Bq mL/sup -1/ /sup 233/U in 0.1 HNO/sub 3/ solution circulated through the flow-cell continuously at a flow rate of 1.0 ml min/sup -1/. The alpha minimum detectable concentration of a CsI:Tl flow-cell with an approximate active volume of 0.075 ml was measured to be 12.4 Bq mL/sup -1/ for a 120-s count time.
Starting Page	375
Ending Page	379
File Size	337482
Page Count	5
File Format	PDF
ISBN	0780373243
ISSN	10823654
DOI	10.1109/NSSMIC.2001.1008480
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-11-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse amplifiers Radiation detectors Signal processing Pulse shaping methods Silicon radiation detectors Coatings Polymer films Preamplifiers Oscilloscopes Data acquisition
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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