Details

Autor(en) / Beteiligte

• Riffaud, Jonathan
• Lépy, Marie-Christine
• Domergue, C.
• Philibert, H.
• Destouches, C.
• Thiollay, N.
• Girard, J.M.

Titel

Improvement of $^{93m}$Nb and $^{93m}$Rh activity measurement methodology for reactor dosimetry

Ist Teil von

• EPJ Web of conferences, 2017, Vol.153

Ort / Verlag

EDP Sciences

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Reactor dosimetry is based on the analysis of the activity of irradiated dosimeters, such as $^{93m}$Nb and $^{103m}$Rh. The activity measurement of these dosimeters is conventionally performed by X-ray spectrometry, but the low-energy of emitted photons makes it difficult to derive reliable results with low uncertainties. Approaches to improve these characterisations are presented: they include high accuracy efficiency calibration of a HPGe detector using both experiments and Monte Carlo simulation, calculation of corrective factors for the geometry (selfabsorption) and self-fluorescence effects. Improvement of the knowledge of the $^{103m}$Rh decay scheme is also required and a specific experiment is proposed, including activity measurement of a $^{103m}$Rh solution by liquid scintillation, and measurement of the photon emission intensities by X-ray spectrometry. A method for calculating coefficients to take into account the self-fluorescence effects in dosimeters is also suggested to improve the uncertainties on activity measurements.