Letter to the editor
The energy of the40K gamma ray and its use as a calibration standard

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Abstract

The energy of the40K gamma ray has been re-measured in order to increase its usefulness as a calibration line for Ge(Li) spectrometers. The observed value, 1460.75 ± 0.06 keV has an uncertainty which is improved by better than an order of magnitude over previous determinations. In addition two gamma rays emitted by natural-occuring thorium have had their energies determined with improved precision: the 727.1 ± 0.1 keV gamma ray emitted by212Bi and the 911.07 ± 0.07 keV gamma ray emitted by228Ac.

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