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  • Author or Editor: T. Sahish x
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Abstract  

The kinetics of isothermal annealing of -irradiation damage in strontium bromate in the range of 120–160 °C is a combination of a first order process affecting 19% of the damage fragments and a second order process, governing the behavior of the remainder. The annealing data have also been analyzed on the basis of models developed by Fletcher and Brown and by Waite.

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Abstract  

The effect of irradiation on the thermal decomposition of strontium bromate has been studied by dynamic thermogravimetry. Irradiaton enhances the decomposition and decreases the energy of activation but does not change the mechanism of decomposition.

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Abstract  

The role of lattice defects introduced by crushing and doping on the annealing of chemical radiation damage in strontium bromate has been investigated. Crushing of irradiated crystals produces direct recovery and also accelerates the subsequent thermal annealing. The initial damage and the susceptibility to thermal annealing are greater in the doped crystals than that in the untreated samples.

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Abstract  

Rehydration of -irradiated anhydrous strontium bromate induces direct recovery of damage. The recovery process is unimolecular and the rehydrated salt is susceptible to thermal annealing.

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Abstract  

The thermal decomposition of -irradiated KClO3 was studied by dynamic thermogravimetry. The reaction order, activation energy, frequency factor and entropy of activation were computed using the Coats-Redfern, Freeman-Carroll and Horowitz-Metzger methods and were compared with those of the unirradiated salt. The decomposition increases with the irradiation dose. The energy of activation decreases on irradiation. The mechanism for the decomposition of unirradiated and irradiated KClO3 follows the Avrami model equation, 1-(1-)1/3, and the rate controlling process is a phase boundary reaction assuming spherical symmetry.

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Abstract  

The kinetics of annealing of -irradiation damage in sodium bromate has been studied. The data are analyzed using the Fletcher-Brown and Waite models and also by conventional kinetic method. The energy of activation for annealing reactions obtained by these different methods are in reasonable agreement.

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