Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1989-02-24
1991-04-09
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
2502521, 2503361, G01T 129
Patent
active
050067141
ABSTRACT:
A probe (10) employs a scintillator (18) as a detector for high-energy beam dosimetry. The scintillator (18) is positioned in an ionizing radiation beam (52) which creates a light output that is proportional to the radiation dose-rate incident upon the scintillator (18). The light is conducted from the scintillator (18) through a light pipe (16) to a photomultiplier tube (28), which converts the light to an electric current. The scintillator (18), the light pipe (16), the photomultiplier (28), and associated optical connections have opaque coverings or sheaths to prevent extraneous light from being introduced into the probe (10). The electric current produced by the photomultiplier tube (28) is proportional to the radiation dose-rate incident upon the scintillator (18). The radiation dose-rate may then be displayed or recorded by a measurement of the electric current. The light pipe (16) is flexible so that the scintillator (18) may be repositioned in a number of locations in the radiation beam (52) to map the radiation field. The scintillator (18) is made of a material that approximates water or muscle tissue in atomic number and electron density to minimize perturbations in a phantom water tank (50). A compensating light pipe 60, paralleling the first, and connected to a second photomultiplier tube, generates a current that, when subtracted from the first photomultiplier tube current, corrects for radiation interactions in the light pipe and photomultiplier tube.
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A. S. Beddar et al., "TE Scintillation Detector for High-Energy Photon and Electron Beam Dosimetry" abstract of oral presentation before World Congress on Medical Physics & Biomedical Eng., San Antonio, Tex., presented 8/6-12/88.
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Eisenberg Jacob M.
Hannaher Constantine
Radiation Measurements, Inc.
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