Emission probabilities and energies of the prominent γ-ray transitions from the 240Pu decay

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Abstract

To permit increased precision in the quantitative assay of 240Pu by means of γ-ray spectrometry, we have remeasured the emission probabilities of the three prominent γ-rays associated with the decay of 240Pu. The γ-ray emission rates were measured using calibrated Ge spectrometers. The decay-rate calibration was based on a measurement of the α-emission rate by NBS. Precise values for the γ-ray energies were also measured. The following results were obtained: 45.244(2), 104.234(6) and 160.308(3) keV for the γ-ray energies, and 43.15(9), 7.18(7) and 0.402(4) photons per 105 decays for the respective γ-ray emission probabilities.

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