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2 196 363

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IPC

(21) (22)

Application

2001107754/06, 2001-03-22

(24)

Start date

2001-03-22

(22)

Actual filing date

2001-03-22

(45)

Published

2003-01-10

(72)

Inventor

Shevchenko V.G.Zaika V.I.Mikhajlov A.I.Tishkov V.M.Busyrev V.L.Kozyk M.P.Dmitriev V.V.

(73)

Holder

Gosudarstvennoe Predprijatie Leningradskaja Atomnaja Ehlektrostantsija Im. V.I.Lenina

METHOD FOR DECONTAMINATING GAMMA-RAY SOURCE CAPSULES Russian patent published in 2003 - IPC

Abstract RU 2196363 C2

FIELD: radiation technology. SUBSTANCE: proposed method designed to clean surfaces of capsules containing high-activity sources from radioactive deposits includes sequential treatment of gamma-ray source capsules with oxidizing solution of potassium permanganate with nitrous acid and reducing solution containing oxalic and nitrous acids. Oxidizing treatment is made with aid of solution containing 30-40 g/l of potassium permanganate and 40-50 g/l of nitrous acid; reducing solution incorporates 40-50 g/l of oxalic acid and 5-7 g of nitrous acid. Upon reducing treatment capsules are rinsed with solution of hydroxyethyl idendiphosphate acid and potassium hydroxide in the amount of 30-40 and 14-20 g/l, respectively. Process is conducted at all stages in nucleate bubbling mode due to radiation heat transfer from sources being treated. EFFECT: enhanced efficiency of decontamination process, simplified design of instruments used, facilitated procedure. 2 cl, 4 dwg, 4 tbl

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RU 2 196 363 C2

Authors

Shevchenko V.G.

Zaika V.I.

Mikhajlov A.I.

Tishkov V.M.

Busyrev V.L.

Kozyk M.P.

Dmitriev V.V.

Dates

2003-01-10—Published

2001-03-22—Filed