Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 19: Detector systems I
T 19.5: Talk
Monday, March 15, 2021, 17:05–17:20, Ts
Gamma spectroscopy of an Americium-Beryllium source with a High Purity Germanium detector in a neutron radiography setup — •Ilya Aleshin, Nina Höflich, and Oliver Pooth — III. Physikalisches Institut B, RWTH Aachen University, D-52056 Aachen
The neutron radiography group at the Physics Institute III B, RWTH Aachen University, develops a multi-pixel detector for fast neutron radiography.
The purpose of fast neutron radiography is to resolve structures in heterogeneous test objects that cannot be well investigated by X-ray radiography. As a neutron source, 2 Americium-Beryllium radioactive sources (16.5 GBq and 16.9 GBq) are used. These sources produce neutrons as well as gamma-rays. For neutron detection, the organic scintillator stilbene (C14H12) is used. This scitntillator allows to distinguish neutron- and gamma-induced signals via their pulse shape.
For the sake of future analyses like for example the prompt gamma neutron activation analysis, which explores the characteristic gamma rays produced by interaction of fast neutrons with matter, precise gamma spectra of the radiography setup (and especially of the Americium-Beryllium sources) are necessary. This talk will focus on the measurement of this spectra with a High Purity Germanium detector and on the spectra themselves. The mode of operation of such a Germanium detector, the positions of this detector with respect to the Americium-Beryllium sources during measurements and the spectra themselves will be presented in this talk.