Abstract
The completely ordered, hexagonal U 2Ti phase is submitted to a sequence of neutron irradiations at a temperature of the order of 100 °C. After each irradiation the X ray diffraction pattern is determined using a X ray diffractometer specially designed for radioactive materials examination. It is found, that the diffraction pattern progressively changes from the one characteristic of the ordered phase to the one corresponding to the cubic desordered phase. Comparing the intensities of the superlattice lines to those of the fundamental lines of the phase, the degree of order is measured as a 0 value for a fluence of 10 18 n/cm 2. This experimental result is interpreted assuming, that every elementary fission causes the complete desordering in a small volume of the ordered matrix. The value of this volume is calculated and equals 3.2 × 10 −17 cm 3. This volume contains roughly 1.7 × 10 6 atoms.
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