Abstract
A comprehensive programme is currently in progress at several laboratories for the development of sensitive, practical and non destructive assay techniques for the quantification of low-level transuranics (TRU) in bulk solid wastes. The present document presents an active detection method for radioactive wastes embedded in high-density matrices, mainly concrete packages. The high density of the packages, as well as their high water content (up to 25%), means only high-energy neutrons or gamma particles have a high enough range to activate the enclosed actinides. Our aims were to evaluate the feasibility of dosing transuranians by induced photofission, and to optimize an experimental system with a view to improving detection limits. The system uses a pulsed electron beam from a linear accelerator (LINAC) to produce high-energy photon bursts from a metallic converter. The photons induce fissions in TRU. When a fission is induced in trace amounts of TRU contaminants in waste material, it provides ``signatures`` from fission products that can be used to assay the material before disposal. We give here the results from counting photofission-induced delayed neutrons from {sup 239}Pu, {sup 235}U and {sup 238}U in three sample matrices: glass, polyethylene and concrete. We counted delayed neutrons emitted after each pulse
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Citation Formats
Lyoussi, A.
Low level transuranic wastes assay by photon interrogation and neutron counting: application to the concrete packages; Dosage par photofissions induites, de faibles quantites d`actinides dans les dechets radioactifs enrobes.
France: N. p.,
1994.
Web.
Lyoussi, A.
Low level transuranic wastes assay by photon interrogation and neutron counting: application to the concrete packages; Dosage par photofissions induites, de faibles quantites d`actinides dans les dechets radioactifs enrobes.
France.
Lyoussi, A.
1994.
"Low level transuranic wastes assay by photon interrogation and neutron counting: application to the concrete packages; Dosage par photofissions induites, de faibles quantites d`actinides dans les dechets radioactifs enrobes."
France.
@misc{etde_10122901,
title = {Low level transuranic wastes assay by photon interrogation and neutron counting: application to the concrete packages; Dosage par photofissions induites, de faibles quantites d`actinides dans les dechets radioactifs enrobes}
author = {Lyoussi, A}
abstractNote = {A comprehensive programme is currently in progress at several laboratories for the development of sensitive, practical and non destructive assay techniques for the quantification of low-level transuranics (TRU) in bulk solid wastes. The present document presents an active detection method for radioactive wastes embedded in high-density matrices, mainly concrete packages. The high density of the packages, as well as their high water content (up to 25%), means only high-energy neutrons or gamma particles have a high enough range to activate the enclosed actinides. Our aims were to evaluate the feasibility of dosing transuranians by induced photofission, and to optimize an experimental system with a view to improving detection limits. The system uses a pulsed electron beam from a linear accelerator (LINAC) to produce high-energy photon bursts from a metallic converter. The photons induce fissions in TRU. When a fission is induced in trace amounts of TRU contaminants in waste material, it provides ``signatures`` from fission products that can be used to assay the material before disposal. We give here the results from counting photofission-induced delayed neutrons from {sup 239}Pu, {sup 235}U and {sup 238}U in three sample matrices: glass, polyethylene and concrete. We counted delayed neutrons emitted after each pulse of the LINAC using the ``Sequential PHoton Interrogation and Neutron Counting Signatures`` (SPHINCS) technique. The electron linear accelerator operates at 15 MeV, 140 mA and 2.5 {mu}s wide pulse at a 50 Hz rate. Finally, use of an electron linear accelerator as a particle source, experimental and electronics details, measurements results and their interpretation and future experimental works are discussed. (author). 53 refs., 101 figs., 21 tabs.}
place = {France}
year = {1994}
month = {Mar}
}
title = {Low level transuranic wastes assay by photon interrogation and neutron counting: application to the concrete packages; Dosage par photofissions induites, de faibles quantites d`actinides dans les dechets radioactifs enrobes}
author = {Lyoussi, A}
abstractNote = {A comprehensive programme is currently in progress at several laboratories for the development of sensitive, practical and non destructive assay techniques for the quantification of low-level transuranics (TRU) in bulk solid wastes. The present document presents an active detection method for radioactive wastes embedded in high-density matrices, mainly concrete packages. The high density of the packages, as well as their high water content (up to 25%), means only high-energy neutrons or gamma particles have a high enough range to activate the enclosed actinides. Our aims were to evaluate the feasibility of dosing transuranians by induced photofission, and to optimize an experimental system with a view to improving detection limits. The system uses a pulsed electron beam from a linear accelerator (LINAC) to produce high-energy photon bursts from a metallic converter. The photons induce fissions in TRU. When a fission is induced in trace amounts of TRU contaminants in waste material, it provides ``signatures`` from fission products that can be used to assay the material before disposal. We give here the results from counting photofission-induced delayed neutrons from {sup 239}Pu, {sup 235}U and {sup 238}U in three sample matrices: glass, polyethylene and concrete. We counted delayed neutrons emitted after each pulse of the LINAC using the ``Sequential PHoton Interrogation and Neutron Counting Signatures`` (SPHINCS) technique. The electron linear accelerator operates at 15 MeV, 140 mA and 2.5 {mu}s wide pulse at a 50 Hz rate. Finally, use of an electron linear accelerator as a particle source, experimental and electronics details, measurements results and their interpretation and future experimental works are discussed. (author). 53 refs., 101 figs., 21 tabs.}
place = {France}
year = {1994}
month = {Mar}
}