(57) To increase the efficiency of utilisation of radiation from a gamma source when irradiating
discrete articles, they are first assembled in an array of such thickness that on
irradiation on one face the dose received at half the thickness from that face is
significantly less than half the dose adjacent that face and may be as little as one-quarter
of that dose. The array is then irradiated equally on both faces, divided midway between
those faces and re-assembled with those faces in contact with one another to form
a new array which in its turn is irradiated from each of the two newly-exposed faces
to the same exposure as before.
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