Advanced LiF technology for the assessment of patient exposure in diagnostic radiology

摘要

The investigations deal with the search for a passive dosemeter applicable to patient dosimetry in diagnostic radi- ology which meets particularly the requirements of a low detection limit and an adequate energy response, as well as sufficiently high precision and reliability. A thermoluminescence dosimetry (TLD) technology is reported that fits there requirements. The detector material consists of lithim fluoride co-doped with copper (LiF:Mg,Cu,P). The detectors, originating form China, are shown to exhibit high radiation sensitivity exceeding that of conventional lithium fluoride, LiF:Mg,Ti(TLD-100), by far. Based on the new technology a detection threshold of 0.1μGy, precision as low as<=1/100 (1σ_rel) and strict linearity of the TL signal- dose relationship were found, for doses up to at least 1 mGy.