Kr-85 sealed radioactive source vacuum inflation system and inflation method

An inflatable system and radioactive source technology, applied in the directions of radioactive source, container filling method, container discharge method, etc., can solve the problems of prolonged production operation time, large pipeline volume, poor inflatable pressure accuracy, etc., and improve operation safety. , Simplify the production process and improve the effect of inflation pressure

Active Publication Date: 2020-09-11
HTA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Because the valves of the system are manual valves, it is easy to cause high doses to the hands; the pipeline volume of the system is large, the vacuum pumping efficiency is low, the production operation time is prolonged, and the exposure dose of personnel is prolonged
Due to the large volume of the pipeline, the 85 The recovery efficiency of the Kr gas cold trap is certain, and there will be residual radioactive gas in the pipeline (the dose on the outer surface of the pipeline can reach 5μSv / h), and the residual gas will be pumped out of the system during the subsequent vacuum pumping, which will easily cause excessive emissions.
The source shell interface is a vacuum rubber tube, which is more prone to aging in the radiation field, causing leakage at the connection, and leaks are prone to occur during the vacuuming and inflation of the source shell
The early Kr-85 sealed radioactive sources were all negative pressure sources. This system has disadvantages such as poor inflation pressure accuracy and poor safety.

Method used

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  • Kr-85 sealed radioactive source vacuum inflation system and inflation method
  • Kr-85 sealed radioactive source vacuum inflation system and inflation method
  • Kr-85 sealed radioactive source vacuum inflation system and inflation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] This embodiment is an inverted Kr-85 raw material. The Kr-85 raw material gas is in a hemispherical tank with a manual valve, the inner cavity of the sphere is 300mL, and the Kr-85 raw material gas pressure is 110kPa.

[0087] The connection between the hemispherical tank and the valve K14 is realized through the metal pipe and ferrule. There is no raw material in the raw material tank in the vacuum inflation system, and the internal absolute pressure is 10Pa.

[0088] Follow the steps below to implement:

[0089] Turn on the vacuum pump, turn on K8, K9, K10, K11, and K14, evacuate the gas in the main pipeline until the vacuum gauge shows 1Pa, and then turn off K8, K9.

[0090] Soak the recovery canister and radioactive source canister in liquid nitrogen for 1 minute.

[0091] Open the manual valve on the hemispherical tank to release the Kr-85 raw material gas so that the raw material gas fills the pipeline.

[0092] Open K12 to make most of the Kr-85 gas in the pi...

Embodiment 2

[0096] This example is the inflation of a 150 kPa source box.

[0097] Put the source box into the aluminum protection module, tighten the threaded pressure head with a special wrench, raise the protection module, and tighten the double ferrule thread to connect the K1-K6 valve.

[0098] Turn on the vacuum pump, turn on K8, K9, K10, and K11, evacuate the gas in the main pipeline until the vacuum gauge reads 1 Pa, and then turn off K10, K11.

[0099] Open the pneumatic valve K7, and the aluminum protection module is evacuated.

[0100] Turn on K1-K6 in turn, and vacuum each source box until the vacuum gauge is 1Pa. Then close K1-K6 and K8. After 1 minute, open K1. If the vacuum gauge rises more than 20Pa after opening the valve, it is judged that the source box connected to K1 is leaking. Open K2-K6 in turn to check the remaining 5 source boxes. leak. Then close the K9 valve.

[0101] Open the K12 valve to release the raw material gas, and then open the K11, K10, K8, K1-K6 ...

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Abstract

The invention relates to a Kr-85 sealed radioactive source vacuum inflation system and an inflation method. The system comprises a booster pump, an aluminum protection module, a radioactive source tank, a low-temperature recovery tank, a reserved expansion port, an instrument, a valve assembly, a pneumatic control component, a pneumatic pump, a vacuum pump and a control box, wherein the pneumaticpump, the vacuum pump and the control box are used in matching. The inflation method comprises the following steps of source box installation; system vacuumizing; source box leakage detection; raw material gas releasing; inflating or pressurizing and inflating; source shell connection cutting off and source shell sealing; liquid nitrogen adding, and pipeline gas recovering by a raw material tank;and liquid nitrogen adding, and residual gas recovery by a tail gas tank. By means of the system, the operation safety is improved, the Kr-85 sealed source performance is improved, the production process is simplified, the inflation pressure is increased, emergency treatment is conducted on accidents in the radioactive source production process, safety protection measures are set, misoperation isprevented, and meanwhile, efficient recovery of residual radioactive gas is achieved.

Description

technical field [0001] The invention belongs to the field of radioactive source vacuum inflation, and in particular relates to a Kr-85 sealed radioactive source vacuum inflation system and an inflation method. Background technique [0002] The Kr-85 sealed radioactive source is a radioactive source made by sealing Kr-85 gas in the source cladding. Kr-85 sealed radioactive source is generally used in β-ray thickness gauge to measure the thickness of paper and film. [0003] There are two methods for preparing the Kr-85 sealed radioactive source: one is to immobilize Kr in a solid carrier by adsorption to make a solid source. Adsorbents include activated carbon, silica gel, zeolite, and cage-like organic compounds such as quinone and the like. However, since the Kr-85 solid source is not very stable, it is only reliable in low temperature environments. When serving in high temperature environments, Kr will decompose from the solid adsorbate. Another preparation method is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C5/06F17C13/02F17C13/04G21G4/06
CPCF17C5/06G21G4/06F17C13/04F17C13/02F17C2221/01F17C2223/0123F17C2227/0135F17C2270/05
Inventor 刘超彭怡刚刘志成梁斌斌董新仲刘畅
Owner HTA CO LTD
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