SIMULTANEOUS MACRO AND MICRO DOSIMETRY WITH MOSFETS

The application of MOSFET dosimeters in complicated mixed radiation fi elds for measurement of absorbed dose distribution in tissue equivalen t phantoms has been studied. The spectra of secondary charged particle s have been measured simultaneously with average absorbed doses by the same MOSFET dosimeter. A good correlation has been observed between n eutron depth dose distribution in a water phantom obtained using MOSFE Ts in integral mode and a tissue equivalent (T.E.) ionisation chamber. Such MOSFET dosimeters are a promising tool for micro-macro dosimetry in Boron Neutron Capture Therapy (BNCT) and Fast Neutron Therapy (FNT ). Paired MOSFETs with one of the dosimeters covered by B-10 have been applied for measuring of average boron dose distribution and microdos imetric spectra due to alpha particles and Li-7 ions throughout a pers pex phantom exposed in the epithermal neutron beam at the Brookhaven M edical Research Reactor (BMRR).