PHYSICAL INSTRUMENTS FOR ECOLOGY, MEDICINE, AND BIOLOGY A Procedure for Determining the Absorbed Dose in a Substance Exposed to Pulsed Heavy Ion Beams

An experimental setup based on the TWACITEP accelerating complex for performing radiobio� logical studies on heavy ion beams is described. Using magnetic elements of transportation lines and collima� tor systems, the procedure for forming a parallel beam with required transverse sizes is adjusted. A dosimetric system intended to measure spatial distributions of absorbed doses in a substance exposed to pulsed beams of heavy ions has been designed and implemented in the performed studies. Using this system, the distribution of the absorbed dose in water was studied for a monoenergetic beam of carbon ions with an initial energy of 215 MeV/amu. Based on this information, the absorbed dose was estimated in a thin water layer for the given depth and beam intensity. The use of this procedure ensures the accuracy in determining the absorbed dose of no worse than 5%.