Abstract
(a) The particles of secondary radiator must be small to avoid internal absorption, i.e., in the particles themselves. Radius certainly < 10μ. (b) Only moderately heavy or very heavy metals seem likely to be usefulas secondary radiators. (c) There is an optimum region of wave-length to be used if such a metal is employed. (d) Amounts of heavy metal of the order of 1 mg. per cubic centimetreof tissue are required to produce an appreciable effect. (e) The secondary β radiation which alone is effective owing to the small amounts of radiator possible, is almost completely absorbed by thickness of tissue of the order of 50μ, and it is therefore essential that the secondary radiators be brought into very intimate contact with the cells to be affected if any effective increased dose is to ensue.
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