Radiant energy – Calibration or standardization methods
Patent
1979-02-12
1982-03-30
Willis, Davis L.
Radiant energy
Calibration or standardization methods
250362, 250363R, 250369, G01D 1800, G01T 120
Patent
active
043226175
ABSTRACT:
Method and apparatus for calibrating a gamma counter, such as a fibrinogen monitor, employing a pulse-height analyzer and a control circuit to determine the optimum high-voltage setting on the photomultiplier tube of a scintillation counter. A first pair of upper and lower pulse-height levels are automatically selected and counts measured to determine if the spectrum of the radioactive source is positioned correctly in the pulse-height domain. A series of measurements are made with differing high-voltage settings to ascertain the desired location of the spectrum. A second pair of upper and lower levels is provided for use in the actual monitoring operation and is automatically set after each calibration operation.
REFERENCES:
patent: 4060726 (1977-11-01), Luitwieler et al.
patent: 4078178 (1978-03-01), Lowes
Fleit & Jacobson
Willis Davis L.
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