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TT: Fachverband Tiefe Temperaturen

TT 29: Poster Session: Cryogenic Particle Detectors and Cyotechnique

TT 29.2: Poster

Montag, 12. März 2018, 15:00–19:00, Poster B

MetroBeta: Beta Spectrometry with Metallic Magnetic Calorimeters in the Framework of the European Program of Ionizing Radiation Metrology — •Michael Paulsen^1,3, Jörn Beyer¹, Lina Bockhorn², Christian Enss³, Daniel Györi³, Sebastian Kempf³, Karsten Kossert², Martin Loidl⁴, Riham Mariam⁴, Ole Nähle², Matias Rodrigues⁴, and Marco Schmidt¹ — ¹Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany — ²Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany — ³Kirchhoff-Institute for Physics, Heidelberg University, Germany — ⁴CEA, LIST, Laboratoire National Henri Becquerel, Saclay, France

MetroBeta is a European project that aims to improve the theoretical calculation and measurement of beta spectrum shapes. The project is part of a common European program of ionizing radiation metrology. The precise knowledge of beta spectrum shapes is required for measuring the activity of pure beta emitters, thus realizing the Becquerel unit for these nuclides. Metallic magnetic calorimeters (MMCs) with the beta emitter sample embedded in the absorber have proven to be among the best beta spectrometers. Four beta spectra will be measured: Sm-151 (Q = 76.3 keV), C-14 (Q = 156.5 keV), Tc-99 (Q = 293.8 keV), Cl-36 (Q = 709.5 keV). A crucial part of the research and development is concerned with source and absorber preparation techniques, which includes producing high quality nuclide samples that need to be integrated into the MMC absorbers.