NONDESTRUCTIVE DETERMINATION OF RADIONUCLIDES IN LUNAR SAMPLES USING A LARGE LOW-BACKGROUND GAMMA-RAY SPECTROMETER AND A NOVEL APPLICATION OF LEAST-SQUARES FITTING. | Zendy

J. S. Eldridge | Zendy; G. D. O’Kelley | Zendy; K. J. Northcutt | Zendy; E. Schonfeld | Zendy

Open Access

NONDESTRUCTIVE DETERMINATION OF RADIONUCLIDES IN LUNAR SAMPLES USING A LARGE LOW-BACKGROUND GAMMA-RAY SPECTROMETER AND A NOVEL APPLICATION OF LEAST-SQUARES FITTING.

Author(s) -

J. S. Eldridge,

G. D. O’Kelley,

K. J. Northcutt,

E. Schonfeld

Publication year - 1972

Language(s) - English

Resource type - Reports

DOI - 10.2172/4654941

Subject(s) - radionuclide , spectrometer , gamma ray spectrometry , gamma ray spectrometer , gamma ray , physics , environmental science , materials science , nuclear physics , optics , radiochemistry , chemistry

Dual-parameter gamma-ray spectrometer systems with large-volume NaI(Tl) crystals and ultra-low background's have been used for the non-destructive determination of K, Th. U. and cosmic-ray produced radionuclides in 60 lunar samples. The total weight of samples measured with these systems is Q8 kg, , and the individual sample weights varied from 2 to 2300 g. Samples from Apollo 11, 12 9 14 9 15, and 16 missions have been measured. Operation of the spectrometers in a coincidence mode and analyzing singlesand coincidence-spectra permits the simultaneous determination of 8-10 radionuclides in each lunar sample.

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