Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1984-10-03
1986-12-23
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
250207, 250361R, 250362, G01T 1167, G01T 1161
Patent
active
046314105
ABSTRACT:
Radioactive specimens are placed in the well (12) of a plastic scintillator body (11), and the light flashes from the scintillator body (11) are picked up by a photomultiplier tube (13). The anode (44) and dynodes (43) of the photomultiplier tube (13) are electrically isolated and a selected biasing voltage is provided across the cathode (42) and dynodes to operate the photomultiplier tube in its linear range at the activity level of the specimen. At high activity levels, the current flowing from the anode (44) is measured by an electrometer (21) to determine a value which is directly related to the activity of the specimen, whereas at lower activity levels where anode current is not accurately measurable, the pulses at the last dynode (50) are counted to determine the scintillation rate and thereby the activity level of the specimen.
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B. G. Dunavant et al., "A Large-Volume 4.pi. Liquid Scintillation Detector", International Journal of Applied Radiation and Isotopes, (1960), vol. 8, pp. 223-227.
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J. D. Cook et al., "Evaluation and Use of a Large Plastic Scintillator for Gamma Counting", J. Lab. & Clin. Med., vol. 61, No. 2, (Feb., 1963), pp. 317-323.
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Hannaher Constantine
Smith Alfred E.
Wisconsin Alumni Research Foundation
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