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Radioactivity observed in the sodium iodide gamma-ray spectrometer returned on the Apollo 17 missionIn order to obtain information on radioactive background induced in the Apollo 15 and 16 gamma-ray spectrometers (7 cm x 7 cm NaI) by particle irradiation during spaceflight, and identical detector was flown and returned to earth on the Apollo 17 mission. The induced radioactivity was monitored both internally and externally from one and a half hours after splashdown. When used in conjunction with a computation scheme for estimating induced activation from calculated trapped proton and cosmic-ray fluences, these results show an important contribution resulting from both thermal and energetic neutrons produced in the heavy spacecraft by cosmic-ray interactions.
Document ID
Document Type
Reprint (Version printed in journal)
Dyer, C. S.
(Computer Sciences Corp. Los Angeles, CA, United States)
Trombka, J. I.
(Computer Sciences Corp. Los Angeles, CA, United States)
Schmadebeck, R. L.
(Computer Sciences Corp. Los Angeles, CA, United States)
Eller, E.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Bielefeld, M. J.
(Computer Sciences Corp. Los Angeles, Calif., United States)
Okelley, G. D.
(Computer Sciences Corp. Los Angeles, CA, United States)
Eldridge, J. S.
(Computer Sciences Corp. Los Angeles, CA, United States)
Northcutt, K. J.
(Oak Ridge National Laboratory Oak Ridge, Tenn., United States)
Metzger, A. E.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Reedy, R. C.
(California, University Los Alamos, N. Mex., United States)
Date Acquired
August 8, 2013
Publication Date
August 1, 1975
Publication Information
Publication: Space Science Instrumentation
Volume: 1
Subject Category
Instrumentation And Photography
Accession Number
Distribution Limits

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