Abstract
The authors studied the effect of temperature (20-380/sup 0/C) and pressure (0.2-15.5 MPa) on the ..gamma.. radiation of CsI in helium-filled Zr-1% Nb alloy cans. It was shown that the decomposition of CsI attains its maximum velocity at a temperature of 380/sup 0/C and a helium pressure of 15.5 MPa (G = 6.8 +/- 1.0 molecules per 100 eV), while lowering the temperature or the pressure diminishes the decomposition velocity of the CsI. The action of ..gamma.. radiation on CsI leads to the failure of helium-filled zirconium cans through corrosion.
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