Abstract
A study is made of the generation of heat due to absorption of γ-rays in non-fissile materials on irradiation in the core of the R.F.T. reactor. A curve showing the relationship between the mass absorption coefficient for γ-rays having the R.F.T. spectrum (1) and the atomic number of the element was obtained by calculation (1). A description is given of a stationary method for determination of the magnitude of the heat evolution q per unit mass of non-fissile material when irradiated inside a heat evolving enclosure in the R.F.T. reactor. The values obtained for aluminium, 30 steel, tin and zinc were 2·2–3·7 W/g for cylindrical specimens of diameter 13·5 and 10 mm for a reactor power of 10 MW. The dependence of q on the distance from the centre line of the reactor within the core has a cosine character. A method is described for isothermal irradiation of specimens in a container at temperatures above that of the coolant.
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