DETERMINATION OF ENERGY DEPOSITED IN NANOMETER SITES FROM IONIZATION DATA

The paper is devoted to the ionisation method for determination of var ious characteristics of energy deposited in small sensitive sites of i rradiated objects by ionising radiation. It is shown that traditional ionisation methods supposing the direct proportionality between energy deposited in a site and the number of ionisations in it fails to dete rmine fluctuation characteristics in nanometre sized sites. The exact formulae connecting fluctuation characteristics of deposited energy an d those of the number of ionisations, are proposed. The new radiation parameters are defined, in particular, fluctuation generalisations of W value; the most important of them are calculated for radiations of d ifferent quality using Monte Carlo techniques. The way to correct theo retical and experimental results obtained by a traditional ionisation method is proposed.