Determination of some parameters for pion radiobiology studies

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Abstract
The central axis depth-dose and stopping rate distribution of the SIN [Schweizerisches Institut fuer Nuklearforschung] biomedical pion beam is reported. The pion stopping rate in a thin disc of tissue-equivalent plastic was determined using a counter telescope. The dose rate at the position of this disc target was measured using a specially designed parallel-plate tissue-equivalent ionization chamber. Both dose rate and pion stopping rate were a function of depth for beams of 2 different momenta spread. The energy deposition required per pion stop to fit the measured dose rate curves was calculated and 37-40 MeV. From the stopping rate measurements the depth-dose distribution of pion interaction dose (star-dose) and the dose due to the pion slowing down were evaluated. The maximum star-dose was at a depth of about 2 g cm-2 beyond the maximum of the ionization dose.

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