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First measurement of the beta spectrum of 241Pu with a cryogenic detector

Martin Loidl 1, * Matias Rodrigues 1 Benjamin Censier 1 S. Kowalski 1 Xavier Mougeot 1 Philippe Cassette 1 Thierry Branger 1 Didier Lacour 1
* Corresponding author
1 LNHB - Laboratoire National Henri Becquerel
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
Abstract : The LNE-LNHB is developing metallic magnetic calorimeters, a specific type of cryogenic detectors, for beta spectrometry. The aim is the determination of the shape factors of beta spectra. Our latest detector has been designed to measure the spectrum of 241Pu, a pure beta emitter with an endpoint energy of 20.8 keV. In this paper, the detection principle of metallic magnetic calorimeters is explained and a detailed description is given of the realization of the detector enclosing a 241Pu source inside the detector absorber. A spectrum resulting from our first measurement is shown and compared with a theoretical spectrum.
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Martin Loidl, Matias Rodrigues, Benjamin Censier, S. Kowalski, Xavier Mougeot, et al.. First measurement of the beta spectrum of 241Pu with a cryogenic detector. Applied Radiation and Isotopes, Elsevier, 2010, 68 (7-8), pp.1454-1458. ⟨10.1016/j.apradiso.2009.11.054⟩. ⟨cea-02475320⟩

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