Abstract
The high photon sensitivity demonstrated by the newly available phosphors, Al 2 O 3 :C and 7 LiF:Mg,Cu,P, makes them attractive for use in personnel and environmental dosimetry. For potential application in mixed neutron-gamma fields, the relative neutron:gamma sensitivity, k u , of these thermoluminescence dosemeters (TLDs) was measured, along with that of the widely used TLD-700 ( 7 LiF:Mg,Ti) for comparison. Narrow spectra neutrons of energies from 0.3 to 14 MeV produced by a Van de Gruff accelerator were used to irradiate pairs of TLDs. The neutron and gamma doses were measured independently using a tissue-equivalent ionisation chamber in combination with a compensated Geiger-Muller detector. For neutron energies from 0.3 to 6.0 MeV, the k u of Al 2 O 3 °C was about one tenth of that of TLD-700. The k u of 7 LiF:Mg,Cu,P was about one third that of TLD-700 for the same neutron energy range. All phosphors showed greater response to 14 MeV neutrons, but the relative neutron:gamma sensitivity of the newer phosphors was one third to one fifth that of TLD-700.
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