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Preparation method of oxygen isotope target

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

Active Publication Date: 2021-03-09
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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Patent Type & Authority Patents(China)
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