Abstract
Fluorescent nuclear track detectors (FNTD) based on natLiF crystals were successfully applied for measurements of neutron doses. FNTDs were exposed on a phantom to Hp(10) doses ranging from 1 mSv to 20 mSv. The number of observed tracks was found to be linear with the dose. The actual limit of detection is certainly much lower than 1 mSv and it depends on the scanned volume of a crystal. The very advantageous feature of LiF FNTDs is that the unirradiated detectors show no tracks similar to that produced by thermal neutrons, which means that background (zero-dose signal) is basically equal to zero. These results were obtained with detectors based on natural lithium and might be substantially improved if 6Li enriched lithium is used for crystal growth.It was also found that LiF FNTDs can be used for direct detection (without any converter) not only of thermal, but also of fast neutrons by using recoil of lithium nuclei.
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