Abstract
Radiation quality is commonly expressed in terms of the LET of the ionizing particles. The detailed mechanism of energy loss of charged particles is such that there is a very complex relation between LET and the energy deposited in some small region of the irradiated tissue. The parameter Y is defined as the energy imparted to a small sphere divided by the sphere diameter. Representation of the dose in Y for a range of diameters yields information on the spatial distribution of energy, as well as on the local dose and the frequency with which such a dose is delivered. It is believed that this representation may prove useful in fundamental radiobiological and radiochemical studies.
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