THE LATEST PHOTODETECTORS for RADIATION DETECTION Yuji
THE LATEST PHOTODETECTORS FOR RADIATION DETECTION Yuji Yoshizava, Seiji Suzuki, Toshikazu Hakamata HAMAMATSU PHOTONICS K.K. 314-5, Shiaokanzo, Toyooka Village, Ivata-gun Shizaoka Pref., Japan, 438-01 In the recent application of radiation, detection.,, performances required for photodetectors vary in the vide range. Meanwhile, new photodetectors have been continuously developed by HAMAMATStf for these requirements. The performances and the test results of such nev photodetectors are discussed in this paper. LR5600 SERIES In applications of radiation measurement and medical instrument, development of more compact and portable equipment has continually progressed. This has led to a strong demand for miniaturization of high sensitive photodetectors such as photomultiplier tubes ( PMTs ), However, it has been difficult to miniaturize conventional PMTs, because they have glass envelopes and sophisticated electrodes structure. Accordingly, PMTs have been chiefly used in high-precision photometric systems, while semiconductor sensors have been used in general purpose, compact Effective Photocattede 18.0 15.S±0.2 / 10±0.2 / , TO-8 Type A Mela| Channe Metal Case Dynode A \ f^W Top View Fig.l Cross section and top view of R5600 and portable equipment. To meet the increasing needs for small pbotodetectors with high sensitivity, HAMAMATSU has developed subminiatnre PMTs, R5600 series, using a metal package in place of the traditional glass envelope. These tubes have a size as small as semiconductor sensors without sacrificing high sensi tivity and high speed response offered by conventional PMTs. R5600 series will prove essential in development of portable photometric devices and in downsizing of equipment- Tie remarkable features of R560Q series are world's smallest size, fast time response, ability of low-light-level detection and good immunity to magnetic fields.
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