CN1032833C - Neutron and gamma-ray radiation shielding material - Google PatentsNeutron and gamma-ray radiation shielding material Download PDF
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- CN1032833C CN1032833C CN 92114783 CN92114783A CN1032833C CN 1032833 C CN1032833 C CN 1032833C CN 92114783 CN92114783 CN 92114783 CN 92114783 A CN92114783 A CN 92114783A CN 1032833 C CN1032833 C CN 1032833C
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- shielding material
- ray radiation
- coupling agent
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The present invention relates to a shielding material for neutrons and gamma rays, which is composed of any one or multiple kinds of polyethylene and polypropylene series polymer, fast neutron moderator, slow neutron absorber, a gamma ray radiation shielding substance and titanate or silane coupling agent, wherein the fast neutron moderator is at lest one of atomic compound of graphite or a dysprosium containing element; the slow neutron absorber is at least one of atomic compound of a boron, lithium or gadolinium containing element; the gamma ray radiation shielding substance is the atomic simple substance of heavy metal element containing lead, bismuth, barium, etc. or at least one of the compound of the atomic simple substance. The content of the fast neutron moderator is from 1% to 40%; the content of the slow neutron absorbent is from 1% to 9%; the content of the gamma ray radiation shielding substance is from 5% to 40%; the content of the coupling agent is from 0.5% to 3%; the surplus content is moulding substance.
The present invention relates to a kind of neutron and gamma-ray radiation shielding material of mouldable moulding.
Along with the widespread use of nuclear radiation, employed radioactive source kind is more and more, and pattern is variation gradually, and source strength is also increasing.Particularly the first class of employed radioactivity prospecting in use needs roving radioactive source in the position in source in the exploration of image-stone oil, human body is pressed close to radioactive source and is easy to health is damaged when picking and placeing, and also makes the operating personnel produce a kind of nervous psychology simultaneously and is prone to accidents.In order to prevent that human body from coming to harm, guarantee the safety of operation, use the shielding protection instrument of making by radiation shielding material pick and place with the moving radiographic source be necessary.But, the shielding properties of existing neutron and gamma-ray radiation shielding material is single, the safety appliance of making can not shield neutron and gamma-rays radiation simultaneously, the fast neutron shielding properties of particularly existing neutron irradiation shielding material is relatively poor, so the appliance load of making is big, heaviness is unfavorable for using.
The purpose of this invention is to provide a kind of have simultaneously neutron irradiation and gamma-ray radiation shielding performance, the various radioactive source apparatus of picking and placeing are made in mouldable moulding, shielding properties is good, and the appliance load of making is light, neutron of being convenient to manipulate and gamma-ray radiation shielding material.
Neutron and gamma-ray radiation shielding material molded adopt in high radiation-resistant high density polyethylene of hydrogen atom density and the polypropylene series polymkeric substance any one or multiple.
The slow neutron absorbing agent adopts in boron carbide, boron nitride, boric acid, boron oxide, lithium fluoride, lithium bromide, lithium carbonate or gadolinium oxide, gadolinium carbonate and the Digadolinium trisulfate one or more, and gamma ray shielding adopts one or more in lead, massicot, lead octoate, lead acetate, bismuth oxide, bismuthic oxide, bismuth chloride and the barium sulphate.
The dispersion of shielding material in molded for the benefit of with mix, employed coupling agent is one or more compounds in titanate ester or the silane coupling agent.
In order to make neutron and gamma-ray radiation shielding material have good shielding properties, be added with fast neutron moderator in the shielding material, the fast neutron moderator that uses is in graphite or dysprosium carbonate, dysprosia, dysprosium chloride and the dysprosium nitrate one or more.
The becoming to be grouped into and be of neutron and gamma-ray radiation shielding material: fast neutron moderator is that 1-40% (potpourri is heavy) slow neutron absorbing agent is that 1 one 9% (potpourri is heavy), gamma ray shielding agent are 5-40% (potpourri is heavy), coupling agent is 0.5-3% (potpourri is heavy), and surplus is a molded.
In order to guarantee that shielding material has good stable radiation shield performance and excellent physical and mechanical properties and material quality, the comparatively ideal composition of neutron and gamma-ray radiation shielding material is: fast neutron moderator is that 2-20% (mixture weight) slow neutron absorbing agent is 2-8% (mixture weight), the gamma ray shielding agent is 10-20% (potpourri is heavy), and coupling agent is that 1-2.5% (potpourri is heavy) surplus is a molded.
When utilizing neutron provided by the invention and gamma-ray radiation shielding material to make apparatus, after taking by weighing material in each material ratio it is mixed, melting mixing is once made the molding material that mixes to twice in the twin-screw mixer machine then, utilizes molding material can moldedly make required apparatus.
The fast neutron that neutron and gamma-ray radiation shielding material are emitted radioactive source carries out slowing down and is together absorbed by the slow neutron absorbing agent in the material with slow neutron that radioactive source is emitted; thereby improved neutron irradiation shielding protection performance; neutron and the gamma-ray radiation shielding that can simultaneously radioactive source be emitted when using neutron and x radiation x shielding apparatus moving radiographic source; can reduce the thickness of apparatus; reduce the weight of apparatus, be convenient to manipulate.
Polypropylene (M130-40) 71 parts (weight), dysprosium carbonate, dysprosia, any one or multiple 10 parts (weight) in dysprosium chloride or the dysprosium nitrate, 8 parts of boron carbides (weight), 10 parts in barium sulphate (weight), 1 part of titanate coupling agent (weight), above-mentioned mixing of materials is evenly after twin-screw mixer machine mixing a pelletizing to the secondary, various mixtures of materials evenly distribute in the pelletizing after tested, polypropylene is external phase, be made into molded pick and place the radioactive source apparatus after, when picking and placeing oil radioactivity well logging probe, measure, radiation shield rate to 18 Curie's americium beryllium neutron source neutrons is 58-63%, gamma ray shielding rate 31-33%, testing tool is that Britain produces MK-7 type neutron dose equivalent rates instrument and PDRI type gamma-rays dose equivalent rate instrument, source rod axis and source active centre are 30 ° to the detector line of centres angle during test, 1 meter of detector centre distance source active centre.
Tygon (MI is 26) 75 parts (weight), graphite 2 minutes (weight), carbonic acid boron, in boron nitride, boron oxide, boric acid, lithium bromide, lithium carbonate, gadolinium oxide, Digadolinium trisulfate or the gadolinium carbonate any one or multiple 2 parts (weight), 20 parts in lead powder (weight), titanate coupling agent 1 part (weight), make by the condition of embodiment 1 and method and to pick and place radioactive source apparatus, the radioactive source that adopts embodiment 1 and testing tool and condition is measured, the neutron irradiation shielding rate is 45-60%, and the gamma ray shielding rate is 40 one 52%.
Tygon (M11.9) 59 (weight), dysprosia 20 parts of (weight), lithium bromide 5 parts of (weight), lead powder, massicot, lead octoate, lead acetate, bismuth oxide, bismuthic oxide, 15 parts of in bismuth chloride and the barium sulphate etc. one or more (weight), 1 part of silane coupling agent (weight), make by the condition of embodiment 1 and method and to pick and place the source apparatus, adopt radioactive source testing tool and the condition of embodiment 1 to measure, the neutron irradiation shielding rate is 59-61%, and the gamma ray shielding rate is 35-48%.
1, a kind of neutron and sub-x radiation x shielding material, the molding material is a high density polyethylene, at least a in the polypropylene series polymkeric substance, the slow neutron absorbing agent is a boron carbide, boron nitride, boric acid, boron oxide, boron fluoride, lithium bromide, lithium carbonate, gadolinium oxide, carbonic acid rolls, at least a in the Digadolinium trisulfate, the slow neutron absorbing agent is 1-9% of a mixture weight, be generally 2-20%, it is characterized in that fast neutron moderator is arranged, gamma-ray radiation shielding material and coupling agent, fast neutron moderator is a graphite, dysprosia, dysprosium chloride, dysprosium sulfate, at least a in the dysprosium carbonate, the gamma-ray radiation shielding material is plumbous, massicot, lead octoate, lead acetate, bismuth oxide, bismuthic oxide, bismuth chloride, at least a in the bismuth sulfate, coupling agent is a titante coupling agent, at least a in the silane coupling agent, fast neutron moderator is 1-40% of a mixture weight, the gamma-ray radiation shielding material is 5-40% of a mixture weight, coupling agent is 0.5-3% of a mixture weight, and surplus is the molding material.
2, by described neutron of claim 1 and gamma ray shielding material, it is characterized in that said fast neutron moderator is 2-20% of a mixture weight, gamma-ray radiation shielding material is 10-20% of a mixture weight, coupling agent is that potpourri is 1-2.5% of a mixture weight, and surplus is the molding material.
Priority Applications (1)
|Application Number||Priority Date||Filing Date||Title|
|CN 92114783 CN1032833C (en)||1992-12-26||1992-12-26||Neutron and gamma-ray radiation shielding material|
Applications Claiming Priority (1)
|Application Number||Priority Date||Filing Date||Title|
|CN 92114783 CN1032833C (en)||1992-12-26||1992-12-26||Neutron and gamma-ray radiation shielding material|
|Publication Number||Publication Date|
|CN1089055A CN1089055A (en)||1994-07-06|
|CN1032833C true CN1032833C (en)||1996-09-18|
Family Applications (1)
|Application Number||Title||Priority Date||Filing Date|
|CN 92114783 Expired - Fee Related CN1032833C (en)||1992-12-26||1992-12-26||Neutron and gamma-ray radiation shielding material|
Country Status (1)
|CN (1)||CN1032833C (en)|
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