Tech Area / Field. Brief Description of TechnologyGamma-sources on the basis of cobalt and europium radionuclides with lateral working surfaces are designed for the use in

• FIR-INS: Fission Reactors / Nuclear Instrumentation
• PHY-ANU: Physics / Atomic and Nuclear Physics

Brief Description of Technology
Gamma-sources on the basis of cobalt and europium radionuclides with lateral working surfaces are designed for the use in radiative gamma-facilities where biotechnological processes are implemented.

SUGGESTED TECHNOLOGY FOR CONDUCTION OF THE RESEARCH

A Co+Eu₂O₃ absorbent composition with a europium oxide content of 15% to 30% is prepared by powder metallurgy. The proportion of europium oxide is chosen according to the necessary efficiency. The absorbing core is manufactured from the obtained composition and made to be used as a control rod in nuclear reactors. The core comes in form of a leak-tight insert. The inserts are withdrawn after reactor irradiation, installed in a second, leak-tight cladding. Then the control operations for -certification are carried out.

ADVANTAGES OF THE SUGGESTED TECHNOLOGY

No special irradiation devices are needed for the storage of radionuclides used in gamma-sources, which in its turn considerably reduces the source price.

EFFECT THAT CAN BE ACHIEVED IN THE COURSE OF THE RESEARCH

No special irradiation devices are needed for the storage of radionuclides used in gamma-sources, which in its turn considerably reduces the source price. Radioactive waste utilization in the form of spent control rods. One source possesses high Co activity and has a Kg = 13.2 with a half-life of 5.27 years, whereas the Eu¹⁵² and Eu¹⁵⁴ isotopes have a smaller Kg = 6.35... 6.7 but a longer half-life (from 8.59 to 3.54 years).

TECHNICAL MEANS AND EQUIPMENT AVAILABLE FOR RESEARCH CONDUCTION

The SSC RIAR has all necessary equipment for the production of gamma-sources on the basis of europium and cobalt:
— research reactors: SM-2, MIR, RBT-6, RBT-10, BOR-60;
— hot cells;
— production of inserts and control rods;
— equipment for control operations and gamma-source attestation.

Scientific Papers
E. P. Klochkov, V. D. Risovany, V. B. Ponomarenko et. al. Eu and Co based gamma-sources. See abstracts of papers for International conference of the USSR Nuclear Society. St. Petersburg, 1992.

V. B. Ponomarenko, E. P. Klochkov, V. D. Risovany et. al. Nuclear reactors controls with Co, Eu oxide or Co+Eu₂O₃ based two-target absorber rods. Paper at the conference on reactor material science, Dimitrovgrad.

E. P. Klochkov, V. D. Risovany. Eu-based gamma-sources. Paper at the International Obninsk symposium on radiology, 27- 31 May, 1996.

E. P. Klochkov, V. D. Risovany. Utilization of europium-containing control rods through the development of gamma-europium sources.

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