Development of a beta spectrometry setup using metallic magnetic calorimeters
Résumé
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
Origine : Fichiers éditeurs autorisés sur une archive ouverte
licence : CC BY - Paternité
licence : CC BY - Paternité