TY - JOUR
T1 - Estimating the gamma-ray contribution to the signal of fission chambers with Monte Carlo simulations
AU - Filliatre, Philippe
AU - Vermeeren, Ludo
AU - Jammes, Christian
AU - Geslot, Benoit
AU - Fourmentel, Damien
A2 - Wéber, Marcel
N1 - Score = 10
PY - 2011/6/2
Y1 - 2011/6/2
N2 - The fission chambers that provide in-core measurements of the neutron flux in
nuclear reactors are also sensitive to the gamma-ray flux. According to experimental data, this contribution can be dominant in current mode. We present a calculation route, relying on a description of the physical phenomena, that compute the gamma-ray signal in a fission chamber, coming directly from the
gamma-ray flux, and indirectly from the neutron flux and activated structures. We use it in a working example for which we show that the main contribution of the
gamma-ray flux to the signal comes from the interaction of the gamma-rays with the electrodes. The relative contribution of gammas created by neutron interactions in the detector is small. The comparison of this example with experimental results yields a good qualitative agreement: the gamma-ray
signal may dominate in current mode, but is effectively suppressed in fluctuation
mode. This calculation route will be useful for the design of fission chambers to be
operated under high neutron and gamma-ray flux.
AB - The fission chambers that provide in-core measurements of the neutron flux in
nuclear reactors are also sensitive to the gamma-ray flux. According to experimental data, this contribution can be dominant in current mode. We present a calculation route, relying on a description of the physical phenomena, that compute the gamma-ray signal in a fission chamber, coming directly from the
gamma-ray flux, and indirectly from the neutron flux and activated structures. We use it in a working example for which we show that the main contribution of the
gamma-ray flux to the signal comes from the interaction of the gamma-rays with the electrodes. The relative contribution of gammas created by neutron interactions in the detector is small. The comparison of this example with experimental results yields a good qualitative agreement: the gamma-ray
signal may dominate in current mode, but is effectively suppressed in fluctuation
mode. This calculation route will be useful for the design of fission chambers to be
operated under high neutron and gamma-ray flux.
KW - fission chamber
KW - gamma
KW - modeling
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_115726
UR - http://knowledgecentre.sckcen.be/so2/bibref/8281
U2 - 10.1016/j.nima.2011.05.065
DO - 10.1016/j.nima.2011.05.065
M3 - Article
SN - 0168-9002
VL - 648
SP - 228
EP - 237
JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 1
ER -