A monitor for heavy ion flux density control based on detection of recoil protons during irradiation of polymer films

An monitor for control of accelerated particle flux density used in irradiation of polymer films with heavy ions with a low track density (103−5 × 107 cm−2) is based on detection of recoil protons. It has been designed to control irradiation of a film with a width of up to 650 mm and is composed of five PIN diodes with a hydrogenous target placed in front of each diode. The sensitivity of the monitor with a polyethylene target to the density of a xenon ion beam is described by a linear function; its value is (4.0±0.5) × 10−3 pulses/(ion/cm2). The instrument is capable of monitoring ion flux densities of