Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1994-10-03
1995-09-12
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
25036309, 2502521, 378207, 364527, G01T 1208
Patent
active
054498970
ABSTRACT:
An automatic gain calibration system for photomultipliers of a scintillation detector operable during periods when a collimator is installed to the scintillation detector. The system provides for calibration of the photomultipliers (PMTs) that are located along the periphery of the detector whose surfaces that are partially or totally obscured by the solid lead edge regions of the installed collimator (e.g., obscured PMTs). In such a manner, the entire scintillation detector may be calibrated effectively without removal of the heavy and awkwardly handled collimator. The automatic calibration system adjusts the preamplification gain associated with each channel of the PMT array to maintain the effective gain of each PMT in response to long term variations in the characteristic gain of each PMT. For calibration, the system measures the response of an obscured PMT to gamma events occurring within a thin strip area that extends into the central portion of the collimator. There is a separate strip area for each obscured tube. The preamplification gain of an obscured tube is then calibrated, when the collimator is installed, based on a recorded value of an originally calibrated response of the obscured PMT for gamma events within this strip area.
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Bertelsen Hugo
Hines Horace H.
ADAC Laboratories
Lee John R.
Westin Edward P.
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