High-purity germanium gamma-ray spectrometer with stirling cycle cryocooler

  • M. N. Kobayashi*
  • , N. Hasebe
  • , T. Miyachi
  • , T. Doke
  • , J. Kikuchi
  • , H. Okada
  • , A. Oka
  • , O. Okudaira
  • , H. Souri
  • , N. Yamashita
  • , E. Shibamura
  • , T. Kashiwagi
  • , T. Takashima
  • , K. Narasaki
  • , K. Tsurumi
  • , K. Mori
  • , L. C. d'Uston
  • , S. Maurice
  • , M. Grande
  • , R. C. Reedy
  • *Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The Japanese lunar polar orbiter SELENE carries a gamma-ray spectrometer which uses a high-purity Ge detector cooled to 80-90 K by a Stirling mechanical cooler. The Gamma-Ray Spectrometer (GRS) consists of a large volume n-type Ge detector (252 cc) as the main detector and bismuth-germanate (BGO) and plastic scintillators as an active shielding. The engineering model still maintains excellent energy resolution even after severe vibration testing. The Gamma-Ray Spectrometer will globally map of the Moon for the major elements of O, Mg, Al, Si, Ti, Fe, etc. and natural radioisotopes of K, Th and U with a high precision. The energy resolution of the GRS is such that it would identify prompt gamma-ray line from hydrogen and the location and the amount of ice, if it exists at the polar regions.

Original languageEnglish
Pages (from-to)1927-1931
Number of pages5
JournalAdvances in Space Research
Volume30
Issue number8
DOIs
Publication statusPublished - 2002

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