ABSTRACT
Neutron dosimetry is done for medical purposes as well as in nuclear research laboratories, reactor centers, nuclear power stations, and industry. A primary requirement for the personnel neutron dosimetry system is that it be able to meet current regulatory requirements. The area monitors are heavy in weight because of the amount of moderator needed for fast neutron dosimetry. Radiation damage to the device is not a problem when neutron dosimetry is the concern, because the dose is measured by the damage caused to the detector. The use of calibrated tissue-equivalent (TE) ionization chambers with TE gas filling is recommended as the practical method for obtaining the tissue kerma in air and the absorbed dose in a TE phantom. Neutrons are non-ionizing particles and are thus identified by detection of ionizing particles emitted in neutron interaction. The dosimeters can be gas-filled, scintillators, TLD, solid-state, track detectors, photographic film, and other types. Gas-filled neutron dosimeters are generally TE ionization chambers.
