Use of a Pulse Detector for Reactor Noise Measurements
作者:
TrinkoJ. R.,
HanauerS. H.,
RouxD. P.,
LorenzoJ. T. De,
期刊:
Nuclear Applications and Technology
(Taylor Available online 1970)
卷期:
Volume 8,
issue 6
页码: 522-530
ISSN:0550-3043
年代: 1970
DOI:10.13182/NT70-A28652
出版商: Taylor&Francis
数据来源: Taylor
摘要:
A pulse-mode neutron detection system designed for reactor noise measurements was characterized and compared with conventional current-mode noise measurement systems. Pulses from a proportional counter with a 60-nsec electron collection time were amplified and applied to a discriminator and thence to a counting-rate circuit with a time constant of 15µsec. Statistical fluctuations in the counting-rate voltage were frequency analyzed.Under conditions of negligible gamma flux and counting loss, the pulse system yielded frequency spectra indistinguishable from ion-chamber spectra. The results were not very sensitive to counting loss up to at least 20%, but the effect of counting loss limited the ultimate useful neutron flux for the system tested to<2×106n/(cm2sec). Space charge and gamma pileup in the detector controlled the performance of the pulse system in high gamma fluxes; the pulse system performed better than the best available current system over a limited range of neutron-and gamma-flux intensities.Because of its shorter time constant, the pulse-mode system can be used to measure power spectral density at much higher frequencies than the current-mode system. Thus, the pulse-mode system appears to be the more attractive for fast reactor subcriticality measurements.
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