Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1982-03-22
1985-06-11
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250363S, 313532, H01J 3150
Patent
active
045230919
ABSTRACT:
The radiation detecting apparatus contains at least one photomultiplier tube for the detection of light. It has been found that the photomultiplier tube will emit erroneous output signals when exposed to a perturbing magnetic field. This is particularly true for photomultiplier tubes used in scintillation cameras and in emission computed tomography systems where the detector head containing photomultipliers changes position during operation. In order to reduce the magnetic field sensitivity, the radiation detection apparatus contains means for superimposing an artificial magnetic field on the perturbing magnetic field at the location of the photomultiplier tube. This artificial field may either be a compensating field or, preferably, an enhancing field which is larger than the perturbing field. The artificial field may be either generated by coils, such as Helmholtz coils, or by a permanent magnet. The coil(s) may be arranged inside or outside the camera head.
REFERENCES:
patent: 3809889 (1974-05-01), McBroom
patent: 4220890 (1980-09-01), Beekmans
patent: 4221967 (1980-09-01), Wang et al.
patent: 4328418 (1982-05-01), Morgan et al.
Siemens Gammasonics Inc.
Westin Edward P.
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