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Monitor calibration for active heavy ion radiotherapy technique was performed in calibration fields which were created by pencil beams in a spot scanning manner. The spot scanning technique with small pencil beams applied at HIRFL-CSR is based on the measurement of particle numbers by ionization chambers being used as on-line beam monitors. The calibration factor of the beam monitors is defined as particle numbers per monitor unit(MU). According to the theory of radiation dosimetry and the application of electronics,the measurement of particle numbers can be translated in terms of absorbed dose.
Monitor calibration for active heavy ion radiotherapy technique was performed in calibration fields which were created by pencil beams in a spot scanning manner. The spot scanning technique with small pencil beams applied at HIRFL-CSR is based on the measurement of particle numbers by ionization chambers being The calibration factor of the beam monitors is defined as particle numbers per monitor unit (MU). According to the theory of radiation dosimetry and the application of electronics, the measurement of particle numbers can be translated in of absorbed dose.