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Radioactive isotope neutron source and preparation method thereof

A radioactive isotope and neutron source technology, applied in the field of radioisotope neutron source, can solve the problems of metal beryllium particle distribution disorder, uneven neutron output, harm to human health, etc., to reduce radioactive pollution and achieve uniform and stable neutron output , the effect of increasing productivity

Active Publication Date: 2009-10-21
北京树诚科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

like figure 1 As shown, because this simple mixing preparation process fails to mix various materials uniformly, the source core of the prepared neutron source is loose and fragile, and the distribution of internal metal beryllium particles is messy, and the particle size is uneven, resulting in uneven neutron output. uniform, unstable
The radioactive substances in the source core are easily diffused after the stainless steel shell is broken, polluting the environment and endangering human health

Method used

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  • Radioactive isotope neutron source and preparation method thereof
  • Radioactive isotope neutron source and preparation method thereof
  • Radioactive isotope neutron source and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 makes 100 milliju Am / Be ceramic neutron source

[0027] 1) Weigh out americium oxide (AmO 2 ) powder 33.33 milligrams, 333.33 milligrams of metal beryllium (Be) powder of 100nm grain size are standby;

[0028] 2) Put the above AmO in an airtight container 2 The powder is mixed with Be powder;

[0029] 3) After the stirring is completed, the material is placed in a closed environment for 3 hours;

[0030] 4) Put the 3) product into an agate ball mill for mixing and ball milling for 10 hours, and the particle size of the material after ball milling is 100nm;

[0031] 5) Use a hydraulic press and cooperate with a steel mold to select the shape according to the demand to press the material into the source core of the required shape;

[0032] 6) Put the pressed source core into a horse boiling furnace and burn it at 100°C for 1 hour;

[0033] 7) Adjust the temperature of the horse boiling furnace to 400°C and burn for 2 hours;

[0034] 8) Adjust the temper...

Embodiment 2

[0038] Embodiment 2 makes 100 milliju Am / Be ceramic neutron source

[0039] 1) Weigh out americium oxide (AmO 2 ) powder 33.33 mg, metal beryllium (Be) powder 333.33 mg of 100nm particle size, and 3.67 mg of flux titanium nitrate (Ti(NO 3 ) 2 )spare;

[0040] 2) Put the above AmO in an airtight container 2 The powder is mixed with Be powder;

[0041] 3) Add the above Ti(NO 3 ) 2 , stir to make it fully mixed;

[0042] 4) After the stirring is completed, the material is placed in a closed environment for 3 hours;

[0043] 5) Put the 4) product into an agate ball mill for mixing and ball milling for 10 hours, and the particle size of the material after ball milling is 100nm;

[0044] 6) add binder stearic acid in the material after ball milling, its weight is 3% of material gross weight after ball milling, constantly stir until mixing;

[0045] 7) Use a hydraulic press and cooperate with a steel mold to select the shape according to the demand to press the material into...

Embodiment 3

[0052] Embodiment 3 makes the Am / Be ceramic neutron source of 100 mCi

[0053] In this embodiment, except for the weight of Be powder, the particle size of Be powder, the storage time in a closed environment, the time of ball milling, the particle size of the material after ball milling, and the ceramic sintering time, the rest of the operating steps and operating conditions are the same as in Example 2. In this embodiment, the weight of Be powder is 199.98 mg, the particle size is 150 nm, placed in a closed environment for 3.5 hours, and the ball milling time is 11 hours. After ball milling, the particle size of the material is 150 nm. The operation of sintering the pressed source core is as follows:

[0054] 100°C 1.5 hours

[0055] 400°C 2.5 hours

[0056]800℃ for 3 hours

[0057] 1000°C for 1.5 hours.

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Abstract

The invention provides a radioactive isotope neutron source, which comprises a source core and a shell, wherein the source core is a ceramic body. The preferable source core of the neutron source comprises americium oxide and / or plutonium oxide and metal beryllium, wherein the granularity of the metal beryllium is between 100 and 200nm, and the americium oxide and / or the plutonium oxide and the metal beryllium are made into nanoscale particles by ball grinding in the preparation process. Additionally, the invention also provides a method for preparing the radioactive isotope neutron source. Because the source core is the ceramic body, the radioactive isotope neutron source has firm and stable source core, does not expand after being soaked in water and reduces the radioactive pollution. In addition, the nanoscale particles are formed in the source core by the ball grinding, so the internal metal beryllium particles are evenly distributed and have even sizes, and neutrons are evenly and stably output.

Description

technical field [0001] The invention relates to a radioactive isotope neutron source, in particular to a neutron source prepared by ceramic sintering technology and a preparation method thereof. Background technique [0002] A neutron source is a device that can generate neutrons, and is a necessary equipment for neutron physics experiments such as neutron nuclear reactions and neutron diffraction. Free neutrons are unstable. They can decay into protons and release electrons and anti-electron neutrinos. The average lifespan is only 15 minutes, and they cannot be stored for a long time. They need to be supplied by appropriate generation methods. At present, there are three main methods: ① Radioactive isotope neutron source: small in size, simple in preparation and convenient in use. The (α, n) neutron source utilizes the nuclear reaction 9Be+α→12C+n+5.701 MeV to mix 238Pu, 226Ra or 241Am emitting α-rays with metal beryllium powder in a certain proportion and press it into a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21G4/02
Inventor 张名程
Owner 北京树诚科技发展有限公司
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