Letter | Published:

Measurement of the Thorium Content of Natural Materials by a γ-Ray Counting Method

Naturevolume 191pages6263 (1961) | Download Citation

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Abstract

RECENT work by S. Raboy and C. C. Traul1 on the background of sodium iodide scintillation counters suggested to us that it should be possible to measure the thorium content of a rock directly by counting the 2.62 MeV. γ-ray emitted in the decay of thorium C″ (208Tl) to stable lead-208, since this γ-ray is more energetic than any in the uranium series. Through the generosity of the American Government a large sodium iodide crystal and suitable photomultiplier and the necessary electronic equipment were available to us to try out the method.

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References

  1. 1

    Raboy, S., and Traul, C. C., Nuc. Inst. and Methods, 9, 145 (1960).

  2. 2

    Van Oostrum, K. J., and Meijer, A. C., Nuc. Inst. and Methods, 10, 31 (1961).

  3. 3

    Picciotto, E., and Wilgain, S., Nature, 173, 632 (1954).

  4. 4

    Hurley, P. M., Bull. Geol. Soc. Amer., 67, 395 (1956).

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Affiliations

  1. Physical Laboratory, Trinity College, Dublin

    • J. H. J. POOLE
    •  & F. N. BYRNE

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https://doi.org/10.1038/191062a0

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