KR830004640A - Decontamination composition suitable for radioactive device - Google Patents

Abstract

No content

Description

Decontamination composition suitable for radioactive device

Since this is an open matter, no full text was included.

1 is a graph showing the radioactive decomposition of EDTA in the CAN-DECON solution of PH4.5 in the presence of sodium formate or formic acid, and FIG. 2 is a CAN-DECON solution of PH4.5 containing sodium formate or formic acid. Graph showing the consumption of citric acid and the production of oxalic acid according to the radiation dose, Figure 3 shows the radiolysis of EDTA in the presence of sodium formate, the radiolysis of EDTA and citric acid in the absence of formate, and Figure 4 shows the radioactive decomposition products of oxalic acid in the presence of acid salts, Figure 4 is similar to Figure 3, showing the decomposition of EDTA and citric acid and the formation of oxalic acid in the presence of formic acid, and Figure 5 is dissolved with two concentrations of formic acid. Graph showing radioactive decomposition of EDTA in the presence of iron and in the presence of dissolved iron without formic acid, Figure 6 shows boron and formate Graph showing the consumption of EDTA, citric acid and oxalic acid when present, FIG. 7 is a graph showing the decomposition of EDTA and citric acid with increasing radiation dose in the presence of ferric oxalate, ferrous sulfate and sodium formate.

Claims (10)

In decontamination preparations containing oxalic acid as one necessary component, it is composed of an organic acid decontaminant controlled by radiolysis and a sufficient amount of formic acid which acts to extend the effectiveness of the decontaminant, the mixture being exposed to ionizing radiation. The decontamination composition wherein said formic acid produces some oxalic acid. The decontaminant composition of claim 1 containing at least some ethylenediamine acetic acid (EDTA). Decontamination agent according to claim 2, wherein the relative ratios of (a) EDTA, (b) citric acid, (c) oxalic acid, and (d) formic acid are by weight 1: (0.6-1.2) :( 0.1-1.2) :( 0.6-3) Composition. The decontaminant composition of claim 3 having a relative ratio of about 1: 1: 1: 1 to me. The decontaminant composition of claim 3 in the form of a solution contained in water or heavy water. The concentrations of (a), (b), (c) and (d) in the solution are about 0.03-0.05% by weight; The decontaminant composition of claim 5 which is 0.02-0.04 weight%; 0.01-0.04 weight%; 0.03-0.15 weight%. The decontaminant solution of claim 5 wherein the solvent is hard or heavy water and contains boron. In the method of removing the contamination by contacting the surface of the reactor or its components with ionizing spinning an aqueous solution of organic acid decontamination agent containing oxalic acid, formic acid is added to the decontaminant solution from the beginning and at least one additional formic acid is added to sustain the formic acid. Decontamination method, characterized in that. The decontamination method according to claim 8, wherein formic acid is added to the circulating decontamination solution and present in the solution at a minimum concentration of about 0.03% by weight. The decontamination method of claim 8 wherein the decontaminant solvent is hard or heavy water and the solution contains boron. ※ Note: The disclosure is based on the initial application.