Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Reexamination Certificate
2006-01-10
2010-02-02
Porta, David P (Department: 2884)
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
C250S367000, C250S370110
Reexamination Certificate
active
07655912
ABSTRACT:
A direction finding radiation detector for detecting the direction of incidence of radioactive rays, comprising: a plurality of scintillators (41, 42, 43) (101, 102, 103) made of the same material, being arranged to overlap circumferentially at least in part so that they are shadowed by each other from radioactive rays incident in circumferential directions and so that light emitted from one of the scintillators is not incident on the other scintillators; and photoreceptor devices (51, 52, 53) (111, 112, 113) having light receiving surfaces optically coupled to the respective scintillators, wherein a combination of proportions of radioactive rays incident directly on the respective scintillators and radioactive rays incident indirectly thereon, being shadowed by the other scintillators, varies with the direction of incidence circumferentially. This achieves weight saving of the detector, improves the detection efficiency of the radioactive rays, elaborates detection information through measurements in half the circumferential directions or all the circumferential directions, and simplifies setting for improved operability.
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Shirakawa; “Zen Hokosei γ-sen Kenshutsuki no Kaihatsu” Hoshasen Kagaku, 2004, vol. 47, No. 9 pp. 292-295.
National Institute of Radiological Sciences News, Sep. 2004, No. 94, pp. 1-2.
Shirakawa Yoshiyuki
Yamano Toshiya
Aloka Co., Ltd.
Green Yara B
National Institute of Radiological Sciences
Oliff & Berridg,e PLC
Porta David P
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