Fast Fission Chamber Amplifier‐Discriminator System

To measure the fission cross section of 233U as a function of neutron energy, instrumentation with fast pulse rise‐time and short resolving time characteristics is required. The efficient detection of fission‐fragment pulses in the presence of a high alpha background requires these characteristics....

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Published in:Review of scientific instruments 1970-01, Vol.41 (11), p.1539-1543
Main Authors: Ingle, R. W., Gillespie, F. E., Weston, L. W.
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Language:English
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description To measure the fission cross section of 233U as a function of neutron energy, instrumentation with fast pulse rise‐time and short resolving time characteristics is required. The efficient detection of fission‐fragment pulses in the presence of a high alpha background requires these characteristics. A fission detector with an electron collection time of 25 nsec and containing 1 g of 233U, and an amplifier with a risetime of 7 nsec and an over‐all gain of 1000 were developed for this measurement. This system, detecting the fast rising current pulse from a parallel plate ionization chamber, is an integral part of the instrumentation used by a group at ORNL engaged in the measurement of the neutron fission and capture cross sections as a function of neutron energy. With this system, the fission cross section of 233U was successfully measured over a neutron energy range from 0.4 to 2000 eV.
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title Fast Fission Chamber Amplifier‐Discriminator System
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