Development of a beta spectrometry setup using metallic magnetic calorimeters

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

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

The precise knowledge of beta spectrum shapes is relevant in radionuclide metrology, e.g. when determining the activity of samples containing beta emitting isotopes, as well as in fundamental research or applications such as nuclear medicine. We present a newly developed beta spectrometer that utilizes Metallic Magnetic Calorimeters (MMCs) which have 4π absorbers and operates at temperatures < 100 mK. Microfabricated MMC detectors designed for five beta energy intervals enable the measurement of beta spectra with endpoint energies Emax ranging from a few tens of keV up to ≈ 1 MeV. The different detector types are read out by Superconducting QUantum Interference Device (SQUID) current sensors with compatible input inductances. In particular, we discuss the MMC detector design, absorber/source preparation, data acquisition and handling of the relatively large measurement data sets. The realized setup allows for high resolution beta spectrometry, which was shown via a test measurement of 99Tc (Emax = 293.8 keV) using an external photon-emitting 241Am calibration source.

Mots clés: metrology; radioactivity; ionizing radiation; beta-rays; beta spectrum; Primary activity measurement; nuclear medicine; spectrometry; beta spectrometer; beta spectrometry; Metallic Magnetic Calorimeter; calorimeter; 4π absorber; detector; spectrum analysis; Superconducting QUantum Interference Device (SQUID); source preparation; data acquisition; big data; high resolution; 99Tc; calibration; 241Am; Reference source; Cryogenic detector; Data processing methods; Spectrometer; signal processing

Domaines: Instrumentations et Détecteurs [physics.ins-det]; Physique Nucléaire Expérimentale [nucl-ex]

M. Paulsen, J. Beyer, L. Bockhorn, C. Enss, S. Kempf, et al.. Development of a beta spectrometry setup using metallic magnetic calorimeters. Journal of Instrumentation, 2019, 14 (08), pp.P08012-P08012. ⟨10.1088/1748-0221/14/08/P08012⟩. ⟨cea-04567155⟩