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Gamma Scintillation Spectrometry of Soil and Tree Leaves¹

ABSTRACT

A two-crystal spectrometer was developed for gamma scintillation spectrometry of low-level environmental samples. Response to gamma-rays and resolution, efficiency, and background characteristics of the spectrometer were determined.

Spectra of gamma emitters in Canfield silt loam sampled in August, 1960, showed the presence of thorium + daughters, uranium + daughters, K⁴⁰, Cs¹³⁷ (190 mc. per mile²), Ru¹⁰⁶-Rh¹⁰⁶ (885 mc. per mile²) and Ce¹⁴⁴-Pr¹⁴⁴ (1275 mc. per mile²). Spectra of tree leaves obtained in the fall of 1959 and counted in June, 1960 showed the presence of Ba¹⁴⁰-La¹⁴⁰, K⁴⁰, Ru¹⁰⁶-Rh¹⁰⁶, Zr⁹⁵-Nb⁹⁵, Cs¹³⁷, Ce¹⁴⁴-Pr¹⁴⁴. Leaves sampled in the fall of 1960 contained K⁴⁰, Cs¹³⁷, Ru¹⁰⁶-Rh¹⁰⁶ and Ce¹⁴⁴-Pr¹⁴⁴.

¹ Journal paper No. 51–61 of the Ohio Agr. Exp. Sta., published with permission of the Director under Atomic Energy Commission Project AT(11-1)-414. Presented before Division II, Soil Science Society of America, Chicago, Ill., Dec. 7, 1960.

² Associate Professor, Ohio Agr. Exp. Sta. and Ohio State University.

Received for publication April 6, 1961. Accepted for publication April 28, 1961.