Method for calculating nuclear material mass in closed vessel
A calculation method and airtight container technology, applied in the field of arms control verification, can solve the problems of inability to save neutron signal time information and high cost
Inactive Publication Date: 2017-08-25
中国人民解放军火箭军工程大学
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[0004] The purpose of this invention is to provide a kind of calculation method of nuclear material quality of airtight container, to overcome existing 3 The thermal neutron multiplicity detection method of He detectors has the problems of high cost and inability to preserve the time information of neutron signals, thereby improving the measurement accuracy of nuclear material quality in closed containers
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[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0058] The purpose of this invention is to provide a kind of calculation method of nuclear material quality of airtight container, to overcome existing 3 The thermal neutron multiplicity detection method of He detectors has the problems of high cost and inability to preserve the time information of neutron signals, thereby improving the measurement accuracy of nuclear material quality in closed containers.
[0059] In order to make the above objects, features ...
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The invention discloses a method for calculating nuclear material mass in a closed vessel. The method comprises a step of obtaining a neutron pulse time sequence of neutron number detected by a liquid scintillation detector, a step of using a foreground multiplicity counter to carry out foreground multiplicity counting on the neutron pulse time sequence, obtaining foreground multiplicity distribution, using a background counter to carry out background multiplicity counting on the neutron pulse time sequence, obtaining background multiplicity distribution, determining true coincidence multiplicity distribution according to the foreground multiplicity distribution and the background multiplicity distribution, determining a population moment of the true coincidence multiplicity, determining a sample moment of the true coincidence multiplicity, and determining a total neutron counting rate, a double-coincidence neutron counting rate and a three-coincidence counting rate according to the population moment and the sample moment, a step of solving a spontaneous fission rate, a sample propagation coefficient and a ratio coefficient, and a step of calculating the mass of a material according to the spontaneous fission rate and the number of spontaneous fission of each second of a nuclear material. The calculation method has the advantages of good accuracy and economical efficiency and good popularization and application values.
Description
technical field [0001] The invention relates to the technical field of arms control verification, in particular to a method for calculating the quality of nuclear materials in a closed container. Background technique [0002] In the three important fields of nuclear disarmament, nuclear safety, and nuclear safeguards that are related to world security, they all face a common scientific and technological problem, that is, the identification, certification, performance testing, and attribute measurement of core materials stored in airtight containers. Attribute is one of its most important properties. based on 3 The thermal neutron multiplicity detection method (NeutronMultiplicity Counting, NMC) of He detector is a more classical method, but due to 3 Reasons such as He material is expensive, have appeared gradually a lot of new detecting methods. Due to recent years 3 The output of He gas has decreased and the demand has increased, so its price has risen rapidly. The curr...
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Login to View More IPC IPC(8): G01T3/06G01N23/09G01N23/10
CPCG01N23/09G01N23/10G01T3/06
Inventor 张全虎黎素芬侯素霞庄琳林洪涛
Owner 中国人民解放军火箭军工程大学