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TT: Fachverband Tiefe Temperaturen
TT 60: Cryogenic Detectors and Sensors, Refrigeration and Thermometry
TT 60.4: Vortrag
Mittwoch, 20. März 2024, 16:45–17:00, H 3025
PrimA-LTD: Advanced magnetic microcalorimeters for radionuclide metrology — •Michael Müller1, Alexander Göggelmann2, and Sebastian Kempf1,3 — 1Institute of Micro- and Nanoelectronic Systems (IMS), Karlsruhe Institute of Technology — 2Physikalisch-Technische Bundesanstalt (PTB) Braunschweig — 3Institute for Data Processing and Electronics (IPE), Karlsruhe Institute of Technology
High uncertainties of available radioactive decay data are more and more a limitation for many applications in science, medicine and industry. Therefore, the EMPIR project “PrimA-LTD” aims to demonstrate advanced decay energy spectroscopy using magnetic microcalorimeters (MMCs), that, in contrast to conventional techniques, provide very low energy threshold and nearly 100 % detection efficiency. In MMCs, the temperature-dependent magnetization of paramagnetic temperature sensor is used to sense the temperature rise resulting from particle absorption in a thermally coupled absorber with utmost precision. We developed two detector types, one being a high energy resolution spectrometer for improving fundamental decay data of 55Fe that is ion-implanted into microfabricated particle absorbers. The other type demonstrates high flexibility in metrological activity measurements by introducing a reusable MMC setup that allows using wire-bonded external absorber/source composites. To estimate their performance, we introduced a simulation framework based on a state space model, applicable to arbitrary detector configurations and benchmarked this model with measured data acquired within the project.
Keywords: Magnetic microcalorimeters; Radionuclide metrology; Primary activity standardization; Thin film fabrication technology