KIP publications

year 2019
author(s) M. Paulsen, J. Beyer, L. Bockhorn, C. Enss, S. Kempf, K. Kossert, M. Loidl, R. Mariam, O. Nähle, P. Ranitzsch and M. Rodrigues
title Development of a beta spectrometry setup using metallic magnetic calorimeters
KIP-Nummer HD-KIP 19-139
KIP-Gruppe(n) F3,F4,F5
document type Paper
Keywords Calorimeters; Cryogenic detectors; Data processing methods; Spectrometers
source JINST 14, P08012 (2019)
doi 10.1088/1748-0221/14/08/P08012
Abstract (en)

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 <100mK. 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.

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