SEMICONDUCTOR NUCLEAR RADIATION DETECTORS (in Japanese)
Silicon p-n junction detectors were fabricated by diffusing phosphorus to 2 mu depth into high resistivity p-type silicon. Various base material resistivities were employed, ranging from 1000 OMEGA -cm to 9600 OMEGA -cm. The devices produced have an encapsulated construction which preserves a good protection of the junction edge. Devices of 2-mm, 5-mm, and 12.5-mm sensitive diameters were tested. Linear response of the detector to 20-Mev alpha particles and signal rise times of several nanoseconds were observed. A neutron-sensitive detector was constructed by depositing a thin layer of Li/sup 6/F between two junction detectors. Neutrons were detected by observing the alpha + T pair resulting from the Li/sup 6/(n, alpha )T reaction. Gamma-ray dose-rate measurements were carried out using the junction detectors as solar cells. The short-circuit current of the detector was proportional to the intensity of the incident radiation. When a scintillation crystal is optically coupled to the detector, the photocurrent increases. Open-circuit voltage of the junction detector is sensitive also to gamma-ray doserate. The open-circuit voltage increases linearly at low dose rate. Lithium ion-drifted p-i-n silicon detectors were prepared by diffusion of lithium into p-type silicon foliowed by electric- field-drift in an oil bath at temperatures ranging from 160 deg to 200 deg C. Resistivities of the base materials of some 100 ohm cms and 1060 ohm cms were employed. Extension of the sensitive region was directly observed with a microscope by etching the side of the drifted element. More than 1000 mu of drifted depth was achieved, while the window thickness of the detector was estimated less than 20 mu . The lithium-drifted detectors have an encapsuiated construction like the junction ones and a sensitive diameter of 5 mm. (A.G.W.)
- Research Organization:
- Tokyo Shibaura Electric Co., Ltd.
- NSA Number:
- NSA-17-030093
- OSTI ID:
- 4699153
- Journal Information:
- Proc. Japan Conf. Radioisotopes, Journal Name: Proc. Japan Conf. Radioisotopes Vol. Vol: 5th, No. 3
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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