Evaluation of polymer-coated CsI:Tl as an alpha/beta pulse shape discriminating flow-cell
- Nuclear Regulatory Commission, Washington, DC (United States)
- Clemson Univ., SC (United States)
A pulse shape discriminating flow-cell radiation detection system constructed with polymer coated CsI:Tl was evaluated for simultaneous gross alpha/gross beta quantification. The CsI:TI scintillator was crushed and sieved to 63-90 {mu}m particle size and microencapsulated with Parylene C to reduce its rate of dissolution. Averaged over the first hour of use, the pulse shape discrimination figure-of-merit was 1.4 and the detection efficiencies were 64.9 {+-} 5.7 %, 52.5 {+-} 4.5 % and 4.5 {+-} 0.2 % for {sup 233}U, {sup 90}Sr/{sup 90}Y and {sup 14}C , respectively. The typical background count rate in the alpha and beta pulse shape window was 0.17 and 0.004 cps, respectively. The resultant minimum detectable activity for a 30 second count time was calculated to be 0.19 {+-} 0.01 Bq, 0.9 {+-} 0.1 Bq and 11.4 {+-} 0.6 Bq for {sup 233}U, {sup 90}Sr/{sup 90}Y and {sup 14}C, respectively. Although the 3 {mu}m thick microencapsulation reduced CsI:Tl dissolution, the detection efficiency declined by a factor of two after 4.8 hours while the pulse shape resolution degraded slightly.
- DOE Contract Number:
- AR21-95MC32110
- OSTI ID:
- 513111
- Report Number(s):
- CONF-961123-; TRN: 97:014164
- Resource Relation:
- Conference: Institute of Electrical and Electronic Engineers (IEEE) nuclear science symposium and medical imaging conference, Anaheim, CA (United States), 2-9 Nov 1996; Other Information: PBD: 1996; Related Information: Is Part Of 1996 IEEE nuclear science symposium - conference record. Volumes 1, 2 and 3; Del Guerra, A. [ed.]; PB: 2138 p.
- Country of Publication:
- United States
- Language:
- English
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