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Preparation method of oxygen isotope target

An oxygen isotope and isotope technology, applied in the field of oxygen isotope target preparation, to achieve the effect of reducing material loss rate

Active Publication Date: 2020-07-03
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commercial channels can only buy gas state from abroad 17 o 2 and 18 o 2 , how to convert the gas state 17 o 2 or 18 o 2 Prepared into solids required for physical experiments 17 O or 18 O target is a difficult problem to be solved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of oxygen isotope target, this method is the oxygen isotope of gaseous state 17 o 2 Oxidation-reduction reaction with tungsten powder to generate powdered W 17o 3 ; Then the obtained powdery W 17 o 3 Prepared by physical vapor deposition method into W 17 o 3 target. The specific steps are:

[0038] (1) Deoxidation treatment of tungsten powder

[0039] During the storage of tungsten powder, the surface will inevitably be oxidized, and the tungsten powder and oxygen isotope 17 o 2 Before the oxidation-reduction reaction occurs, deoxidation treatment is required to reduce the tungsten powder as much as possible. 16 O impurity.

[0040] (2) Tungsten powder and gas state 17 o 2 The reaction produces powdered W 17 o 3 ;

[0041] (3) the powdered W obtained in step (2) 17 o 3 Pressed into flakes by a tablet press W 17 o 3 ; Pressing into flakes is beneficial to the follow-up target making operation, so as to minimize the loss of preci...

Embodiment 2

[0045] Different from Example 1, the oxygen isotope in the gaseous state is 18 o 2 , tungsten powder and gas state 18 o 2 The reaction produces powdered W 18 o 3 , W prepared in step (4) 18 o 3 The thickness of the target is 60μg / cm 2 . W 18 o 3 target product 16 O / 18 The ratio of O is 4.2%.

Embodiment 3

[0047] The difference from Example 1 is that the deoxidation treatment uses hydrogen to reduce the surface oxidized tungsten powder to W, and the specific reaction formula is WO 3 +3H 2 →W+3H 2 O; the reaction is divided into two stages, the first stage is the WO at 600°C 3 Revert to WO 2 , this stage lasts for 12min; in the second stage, WO 2 Revert to W, and this stage lasts for 17 minutes.

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Abstract

The invention belongs to the technical field of target material preparation, and discloses a preparation method of an oxygen isotope target. The method comprises the following steps: carrying out a redox reaction on gaseous oxygen isotope 17O2 or 18O2 and tungsten powder to generate powdery W17O3 or W18O3, and preparing a W17O3 or W18O3 target material from powdery W17O3 or W18O3 by using a physical vapor deposition method. The preparation method has the beneficial effects of low 16O content, high material utilization rate, low preparation cost, high yield, and simpleness.

Description

technical field [0001] The invention belongs to the technical field of target preparation, and in particular relates to a preparation method of an oxygen isotope target. Background technique [0002] O has three isotopes in nature, which are 16 O. 17 O and 18 O, their abundances in nature are 99.762%, 0.038% and 0.2%, respectively, due to 17 O and 18 The abundance of O in nature is extremely low, so the concentrated high abundance (above 99%) 17 O and 18 O material is very expensive. [0003] 17 O and 18 O is of great significance in nuclear physics research, nuclear physics scientists study 17 O and 18 The relevant nuclear reactivity properties of O often require a solid state 17 O and 18 O target. At present, commercial channels can only buy gas state from abroad 17 o 2 and 18 o 2 , how to convert the gas state 17 o 2 or 18 o 2 Prepared into solids required for physical experiments 17 O or 18 O target is a difficult problem to be solved urgently at p...

Claims

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Application Information

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IPC IPC(8): C01G41/02C04B35/495C04B35/622C04B41/87C23C14/08C23C14/24
CPCC01G41/02C04B35/495C04B35/62222C04B41/009C04B41/5025C04B41/87C04B2235/614C23C14/083C23C14/24C04B35/52
Inventor 樊启文孟波王华
Owner CHINA INSTITUTE OF ATOMIC ENERGY