Measurement of absolute K X-ray emission intensities in the decay of Rh-103m

Jonathan Riffaud (1) , Philippe Cassette (1) , Didier Lacour (1) , Valérie Lourenço (1) , Isabelle Tartes (1) , Mark Kellett (1) , Margot Corbel (1) , Marie-Christine Lépy (1) , C. Domergue (2) , C. Destouches (2) , H. Carcreff (3) , O. Vigneau (4)

1 LNHB - Laboratoire National Henri Becquerel
2 LDCI - Laboratoire de Dosimétrie, de Contrôle-commande et Instrumentation
3 DRSN - Département des Réacteurs et des Services Nucléaires
4 LARC - Laboratoire d'Analyses Radiochimiques et Chimiques

A new experiment was designed to measure the photon emission intensities in the decay of Rh-103m. The rhodium samples were activated in the ISIS experimental nuclear reactor at CEA Saclay. The procedure includes an absolute activity measurement by liquid scintillation counting using the Triple-to-Double Coincidence Ratio method, followed by X-ray spectrometry using a high-purity germanium detector to determine the photon emission intensities. The new result I-x = 0.0825 (17)) is derived with a significant reduction of the uncertainty.

Keywords: Reactor dosimetry; Rh-103m; X-ray spectrometry; Photon emission intensity; TDCR method

Domains: Nuclear Experiment [nucl-ex]; Optics / Photonic

Jonathan Riffaud, Philippe Cassette, Didier Lacour, Valérie Lourenço, Isabelle Tartes, et al.. Measurement of absolute K X-ray emission intensities in the decay of Rh-103m. Applied Radiation and Isotopes, 2018, 134 (SI), pp.399-405. ⟨10.1016/j.apradiso.2017.10.003⟩. ⟨cea-01803820⟩