Aluminium Oxide Exoelectron Dosimetry

The exoemission properties of aluminium oxide (a-Al2O3:C) in the forms of both a single crystal and of powder, have been investigated. Measurements obtained during readout in a vacuum showed that irradiated Al2O3:C dosemeters emit exoelectrons with a sensitivity that is 10-20 times higher than that achievable using beryllium oxide (BeO) exoelectron dosemeters (EEDs). This paper presents results of studies using a commercial methane gas reader. The investigators studied the response of the Al2O3:C EEDs as a function of beta energy and measured the dose-response relationship. The effect of humidity on the dosemeter response was also investigated.