Beta spectrometry with metallic magnetic calorimeters in the framework of the European EMPIR project MetroBeta

Martin Loidl (1) , J. Beyer (2) , L. Bockhorn (3) , C. Enss (4) , S. Kempf (4) , K. Kossert (3) , Riham Mariam (1) , O. Nähle (3) , M. Paulsen (2) , P. Ranitzsch (3) , Matias Rodrigues (1) , M. Schmidt (2)

1 LNHB (CEA, LIST) - Laboratoire National Henri Becquerel (CEA, LIST)
2 PTB - Physikalisch-Technische Bundesanstalt [Berlin]
3 PTB - Physikalisch-Technische Bundesanstalt [Braunschweig]
4 Kirchhoff Institute for Physics

The aim of the European Metrology Research Project MetroBeta is to improve the knowledge of the shapes of beta spectra, both in terms of theoretical calculation and measurement. The precise knowledge of beta spectra is required for the activity standardisation of pure beta emitters. Metallic magnetic calorimeters (MMCs), a type of cryogenic detectors, with the beta emitter embedded in the absorber have proven to be among the best beta spectrometers, in particular for low-energy beta transitions. Within this project, new designs of MMCs optimized for five different beta energy ranges were developed and a new detector module was constructed. The beta spectra of 151Sm, 14C and 99Tc have been measured so far; additional measurements with 36Cl are under preparation. Improved theoretical calculation methods and complementary measurement techniques complete the project.

Keywords: beta energy range; 151Sm; 14C; 99Tc; metrology; ionizing radiation; radioactivity; beta-rays; spectrum analysis; beta spectra; pure beta emitter; Metallic magnetic calorimeter; calorimeter; cryogenic detector; detector; instrumentation; nuclear instrumentation; absorber; beta spectrometer; spectrometry; low-energy beta transition

Domains: Nuclear Experiment [nucl-ex]; Nuclear Theory [nucl-th]; Instrumentation and Detectors [physics.ins-det]

Martin Loidl, J. Beyer, L. Bockhorn, C. Enss, S. Kempf, et al.. Beta spectrometry with metallic magnetic calorimeters in the framework of the European EMPIR project MetroBeta. Applied Radiation and Isotopes, 2019, 153, pp.108830. ⟨10.1016/j.apradiso.2019.108830⟩. ⟨cea-04566122⟩