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 (SciVal)


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
Issue number8
Publication statusPublished - 2002


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