JPS5883299A - Method of treating outfit contaminated with radiation material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating equipment contaminated with radioactive substances, and is a method for rendering clothing and other equipment worn by workers at a nuclear power plant or the like harmless under simple processing conditions and allowing them to be used repeatedly. The aim is to provide a method that allows for The effective use of nuclear power KIII has recently been widely studied and researched around the world, and it is well known that nuclear power generation is gradually becoming more and more popular. - By the way, employees who work at such nuclear facilities are exposed to radiation, and it is natural that they wear clothing and other equipment to prevent damage from the radioactive materials, but such equipment does not prevent radioactive materials from adhering to them. If such substances are found to be present, the clothing, etc., must be disposed of. -In the past, there was no suitable method to render such contaminated equipment harmless, so equipment that was contaminated or had the potential to be contaminated had no choice but to be removed. In addition to significantly increasing the cost of clothing and other equipment, the school has no choice but to also reduce the cost of disposing of the aneurysm.

The present invention has been developed after repeated studies in view of the above-mentioned circumstances, and includes the addition of salt and ethyl alcohol or methyl alcohol, one or both of which are contained, and sodium hypochlorite based bleaching. This proposal proposes the treatment of clothing and other equipment by placing them in washing water that has also been treated with chemicals, and the appropriate detoxification treatment can be carried out under normal temperature conditions using a general washing machine, etc. It is.

The above-mentioned salt is added in an amount of 10 to 20 parts by weight per 500 parts by weight of treated water.
By adding and dissolving parts by volume, a saline solution with an appropriate concentration can be obtained, and ethyl alcohol (CgHiOH) is added to this solution.
Or, 80 to 200 parts by volume of methyl alcohol is added and mixed.In this case, the main ingredient in the removal process of radioactive substances (neutrons) is the above-mentioned salt, and ethyl alcohol is used internationally as a method of removing contaminated clothing. for a long period of time (150
It was confirmed that the stains and other stains that occurred during the storage period were effectively removed. In other words, according to the results of specific studies conducted by the present inventors, table salt exhibits a particularly excellent erasing effect against the above-mentioned neutron beams, and it can be used for up to 150 days on clothing contaminated with this type of radioactive material. As mentioned above, it is legally required for KM to be stored for up to 100 days (and by storing it in this way, clothes etc. that are partially contaminated with a high concentration of several hundred bekocuries will lose their radioactivity). The amount of pollution has gradually decreased to less than 10 Bq, but in recent years people have started changing their clothes earlier and the degree of contamination has gradually decreased (
During the storage period as mentioned above, all clothes, etc. were contaminated, and moreover, it had penetrated into the fiber tissue that makes up the clothes, etc.
In the present invention, it is presumed that the washing water containing the above-mentioned common salt can be used to properly eliminate or absorb the water at room temperature. This salt also has the effect of preventing alcohol components such as ethyl alcohol from igniting, allowing work to be carried out under safe conditions. Regarding sodium hypochlorite, as mentioned above, 100% (
f: By using the above, an effective finish can be obtained, and the addition of a considerably large amount will not damage the fabric of the garment, but generally an upper limit of 2500C is sufficient, and addition of more than that is not allowed. It's the economy.

Specific embodiments of the present invention will be described below.

Example 1 Work clothes that had been stored for 150 days after contamination and were detected to have a contamination level of 3.5 B.C. The sample was immersed in washing water containing 200 parts of Hyter (produced and sold by Hyter) and washed for 25 minutes at room temperature using a commercially available washing machine.

This clothing was then washed with water, dehydrated and dried, and the result of measuring the degree of contamination of 10 was less than 1 becocurie, confirming that it had been properly rendered harmless.The clothing fabric was also treated with the above treatment. I learned that I wasn't hurt at all.

Example 2: The degree of contamination in work clothes stored for 150 days after contamination was 6.
This is a Baekki lily, and this one is placed in an iron container with a lid, 51 parts of water, 2.5 # of salt, and 1 part of ferric ammonium sulfate.
．． 5# and soda carbonate were added and dissolved in the treatment liquid, the charging port was closed with an iron lid, and the mixture was heated and boiled at about 100° C. for 4 minutes.

After this treatment, the work clothes taken out from the container were measured to have a contamination level of 3, and were subsequently used in Example 1.
The sample was placed in washing water having the same composition as in step 1 and washed for 20 minutes, then washed with water, dehydrated and dried to finish.

That is, when we measured the adhesion resistance of radioactive materials on the work clothes after performing these series of treatments, the same detection sound was obtained in the shelf measuring instrument as in seawater, which is estimated to be less than 1 Becochier. I learned that radioactive materials were effectively removed.

Claims (1)

[Scope of Claims] 1. A method for treating equipment contaminated with radioactive substances, which comprises washing the equipment contaminated with radioactive substances in washing water containing salt and one or both of ethyl alcohol and methyl alcohol. . 2. The method for treating equipment contaminated with radioactive materials according to claim 1, which comprises washing the equipment with washing water that also contains a sodium hypochlorite bleach.