Measurement of the absolute gamma-ray emission intensities from the decay of $^{103}$Pd

Jonathan Riffaud (1) , Philippe Cassette (1) , Margot Corbel (1) , Marie-Christine Lepy (1) , Valérie Lourenço (1) , Mark Kellett (1)

1 LNHB (CEA, LIST) - Laboratoire National Henri Becquerel (CEA, LIST)

Palladium-103 is a radioisotope of interest in medical applications which is used in brachytherapy implants for the treatment of prostate cancer. It decays through electron capture to excited levels of $^{103}$Rh, and especially to the 39.756 keV metastable state. The half-life of $^{103}$Pd was measured by gamma-ray spectrometry on a HPGe detector on an aliquot of the diluted solution, for 50 days. The absolute photon emission intensities were obtained by gamma-ray spectrometry using a solution whose mass activity was obtained by liquid scintillation, using the TDCR method. The full-energy peak efficiency of the detectors were previously calibrated with LNE-LNHB standard sources. The 357-keV photon emission intensity per 100 disintegrations obtained is 0.02464(16), in perfect agreement with the tabulated data (0.0246 (6)), and with a reduced uncertainty. In addition, the emission intensities of five other gamma-rays was also derived with a significant reduction of the uncertainties.

Mots clés: metrology; ionizing radiation; radioactivity; spectrometry; Decay data measurement

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

Jonathan Riffaud, Philippe Cassette, Margot Corbel, Marie-Christine Lepy, Valérie Lourenço, et al.. Measurement of the absolute gamma-ray emission intensities from the decay of $^{103}$Pd. IRCM 2019 - 22nd International Conference on Radionuclide Metrology and its Applications, May 2019, Salamanca, Spain. ICRM technical series on radionuclide metrology, ISSN: 2522-4328, 167, pp.111, 2021, Proceedings of the 22nd International Conference on Radionuclide Metrology and its Applications (ICRM 2019). ⟨cea-03044492⟩