High-sensitivity Transuranic Waste Assay by Simultaneous Proton and Thermal-neutron Interrogation Using an Electron Linear Accelerator PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Simultaneous photon and neutron interrogation from electron linear accelerator pulses is used as the basis for a unique assay technique for transuranics. Both prompt and delayed neutrons from the induced fissions are counted on a single detection system, and the contributions from each interrogating flux are resolved. Detection limits (3 sigma) for 239Pu were estimated to be 3 mg for prompt fission neutrons and 6 mg for delayed neutrons. The technique also provides a clear distinction between fissile and fertile nuclides.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Simultaneous photon and neutron interrogation from electron linear accelerator pulses is used as the basis for a unique assay technique for transuranics. Both prompt and delayed neutrons from the induced fissions are counted on a single detection system, and the contributions from each interrogating flux are resolved. Detection limits (3 sigma) for 239Pu were estimated to be 3 mg for prompt fission neutrons and 6 mg for delayed neutrons. The technique also provides a clear distinction between fissile and fertile nuclides.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A slagging pyrolysis incinerator has been proposed to reduce the volume of stored transuranic (TRU) waste material. This report describes the electronics developed for a fast TRU waste assay system using photon interrogation. The system uses a pulsed electron beam from a linear accelerator to produce a high-energy photon burst, termed the gamma flash, from a metallic converter. The photons induce fission in the TRU. A high-rate counting system is used to relate the production rate of photon induced neutrons to the amount of fissile material present in the waste.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
During the past year, we tested and evaluated the performance of an assay system that accommodates 55-gal drums of transuranic waste at Oak Ridge National Laboratory. This neutron assay system provides a routine assay of fissile transuranic isotopes to the 1-mg sensitivity level with a pulsed active neutron interrogation based on the differential dieaway technique. A highly sensitive passive neutron measurement determines the content of spontaneous fission transuranic isotopes in each drum as well as an upper-bound estimate of the total alpha activity. All components of the combined, pulsed active and passive neutron assay system performed well on a routine basis during the test-and-evaluation period. We performed more than 400 combined passive and active assay measurements of waste drums at Oak Ridge. One-fifth of the initial set of waste drums measured contain less than 100 nCi/g of total transuranic isotopes and thus qualify legally as nontransuranic waste.
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Author: Cheng-Wei Wu
Author: A. G. Blasewitz
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