Title :
CsI(Tl) with photodiodes for identifying subsurface radionuclide contamination
Author :
Meisner, J.E. ; Nicaise, W.F. ; Stromswold, D.C.
Author_Institution :
Westinghouse Hanford Co., Richland, WA, USA
Abstract :
A cylindrical (15×61 mm) CsI(Tl) scintillation detector with two side-mounted photodiodes has been developed to collect spectral gamma-ray data in subsurface contaminated formations at the US Department of Energy´s Hanford Site. It operates inside small-diameter, thick-wall steel pipes pushed into the ground to depths up to 20 m by a cone penetrometer system. The detector provides a rugged, efficient, magnetic-field-insensitive means for identifying gamma-ray-emitting contaminants (mainly 137Cs and 60Co). Mounting two 3×30-mm photodiodes end-to-end on a flat area along the detector´s side provides efficient light collection over the length of the detector
Keywords :
caesium compounds; gamma-ray detection; photodiodes; pollution measurement; radiation monitoring; radiation protection; radioactive pollution; solid scintillation detectors; thallium; 15 mm; 3 mm; 30 mm; 61 mm; 137Cs; 60Co; Co; Cs; CsI:Tl; Hanford Site; cone penetrometer system; cylindrical scintillation detector; gamma-ray data; gamma-ray-emitting contaminants; light collection; magnetic-field-insensitive method; side-mounted photodiodes; small-diameter steel pipes; subsurface contaminated formations; subsurface radionuclide contamination; thick-wall steel pipes; Contamination; Drilling; Electrical resistance measurement; Gamma ray detection; Gamma ray detectors; Laboratories; Photodiodes; Pollution measurement; Soil measurements; Steel;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1994., 1994 IEEE Conference Record
Print_ISBN :
0-7803-2544-3
DOI :
10.1109/NSSMIC.1994.474345
