Method and apparatus for probing nuclear material by photofission
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01T-001/167
G01T-003/00
출원번호
US-0570829
(2005-06-14)
등록번호
US-9297908
(2016-03-29)
우선권정보
FR-04 06735 (2004-06-21)
국제출원번호
PCT/FR2005/001462
(2005-06-14)
§371/§102 date
20080725
(20080725)
국제공개번호
WO2006/008360
(2006-01-26)
발명자
/ 주소
Safa, Henri
출원인 / 주소
Commissariat A L'Energie Atomique
대리인 / 주소
Alston & Bird LLP
인용정보
피인용 횟수 :
0인용 특허 :
11
초록▼
The invention relates to a method and a system for using photofission to probe an article containing potentially radiation-emitting elements. The article is bombarded by a beam of electrons of sufficient energy, and they are converted into photons by bremsstrahlung directly within the article to be
The invention relates to a method and a system for using photofission to probe an article containing potentially radiation-emitting elements. The article is bombarded by a beam of electrons of sufficient energy, and they are converted into photons by bremsstrahlung directly within the article to be probed, which article is likely to contain photofissile material. No target is added to the package to perform this conversion. Preferably, the article to be probed is a package of radioactive waste, in which the container is made of thick absorbent concrete.
대표청구항▼
1. A method of probing an article containing radiation-emitting elements comprised of actinides, comprising: (a) irradiating an article with an electron beam;wherein the article comprises:a peripheral concrete material container made of concrete, and radioactive waste content located in an interior
1. A method of probing an article containing radiation-emitting elements comprised of actinides, comprising: (a) irradiating an article with an electron beam;wherein the article comprises:a peripheral concrete material container made of concrete, and radioactive waste content located in an interior of the container, wherein the content includes radiation-emitting elements comprising actinides,wherein the electron beam irradiates the article directly, including the container, without a Bremsstrahlung target being disposed in a path between the electrons of the electron beam and the article,wherein the irradiating causes electrons from the electron beam to pass through the concrete and into the interior, wherein thickness of the concrete is less than a distance which would have caused the electrons to convert into photons in concrete;(b) striking a nuclear material with electrons from the electron beam which passed through the concrete in step (a), wherein the striking causes conversion of the electrons into photons;(c) generating photofission in the actinides with photons produced by the conversion of the electrons in step (b), wherein the photofission causes neutrons to be produced; and(d) operating at least one neutron detector to measure neutrons produced by the photofission in step (c). 2. A method according to claim 1, wherein, by irradiating the article by means of the electron beam, particles emitted by irradiated portions are detected simultaneously so as to locate the radiation-emitting elements within the article. 3. A method of probing an article containing radiation-emitting elements comprised of actinides, comprising: (a) irradiating an article with a pulsed electron beam,wherein the article comprises: a peripheral concrete material container made of concrete, andradioactive waste content located in an interior of the container, wherein the content includes radiation-emitting elements comprising actinides,wherein the electron beam irradiates the article directly, including the container, without a Bremsstrahlung target being disposed in a path between the electrons of the electron beam and the article,wherein the irradiating causes electrons from the electron beam to pass through the concrete and into the interior, wherein thickness of the concrete is less than a distance which would have caused the electrons to convert into photons in concretes;(b) striking a nuclear material with electrons from the electron beam which passed through the concrete in step (a), wherein the striking causes conversion of the electrons into photons;(c) generating photofission in the actinides with photons produced by the conversion of the electrons in step (b), wherein the photofission causes delayed neutrons to be produced after a flash resulting from an electron beam pulse and causes prompt neutrons emitted during the electron beam pulse;(d) operating at least one neutron detector to measure neutrons produced by the photofission in step (c); and (e) calculating the ratio of measured prompt neutrons to delayed neutrons so as to determine the isotopic composition of actinides in the radiation-emitting elements. 4. A method of probing an article containing radiation-emitting elements comprised of actinides, comprising: (a) irradiating an article with a pulsed electron beam,wherein the article comprises: a peripheral concrete material container made of concrete, andradioactive waste content located in an interior of the container, wherein the content includes radiation-emitting elements comprising actinides,wherein the electron beam irradiates the article directly, including the container,wherein the irradiating causes electrons from the electron beam to pass through the concrete and into the interior, wherein thickness of the concrete is less than a distance which would have caused the electrons to convert into photons in concrete;(b) striking a nuclear material with electrons from the electron beam which passed through the concrete in step (a), wherein the striking causes conversion of the electrons into photons;(c) generating photofission in the actinides with photons produced by the conversion of the electrons in step (b), wherein the photofission causes delayed neutrons to be produced after a flash resulting from an electron beam pulse and causes prompt neutrons emitted during the electron beam pulse;(d) operating at least one neutron detector to measure neutrons produced by the photofission in step (c); and(e) calculating the total quantity of actinides in the radiation-emitting elements from the measured prompt neutrons and delayed neutrons. 5. A method according to claim 4, wherein the irradiating is carried out by transporting the electron beam up to the article in a vacuum line.
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이 특허에 인용된 특허 (11)
Caldwell John T. (Los Alamos NM) Kunz Walter E. (Santa Fe NM) Cates Michael R. (Oak Ridge TN) Franks Larry A. (Santa Barbara CA), Apparatus and method for quantitatively evaluating total fissile and total fertile nuclide content in samples.
Bernard Patrice (Venelles FRX) Cloue Jean (Manosque FRX) Pinel Jacques (Beaumont De Pertuis FRX) Romeyer-Dherbey Jacques (Aix en Provence FRX), Apparatus for determining number of neutrons emitted by fissile material during induced fissile.
Allen John Thomas ; Sullivan ; Jr. George Michael ; Brazell Michael Scott ; Knowles Harrold Brook ; Zante Anthony Alexander ; Mendonsa Richard Joseph ; Miller Richard Clarke ; Whitham Kenneth, Article irradiation system in which article-transporting conveyor is closely encompassed by shielding material.
Peck Richard O. (Lakewood CO) Pageau Gary M. (Englewood CO) Williams Colin B. (Denver CO) Allen John T. (San Diego CA) Wickersham Bernard G. (Parker CO) Bisgrove Leonard C. (Evergreen CO) Sellers Bru, Irradiation system utilizing conveyor-transported article carriers.
Wilson David A. (Richwood TX) Christiansen Steven H. (Richwood TX) Simon Jaime (Angleton TX) Morin Dana W. (Angleton TX), Process for selectively concentrating the radioactivity of thorium containing magnesium slag.
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