The Detector Efficiency in Radiation Measurement and a Practice in Nuclear Medicine

The sensitivity of detector mainly depends on two parameters as energy resolution and detection efficiency. In the studies made with radioisotopes, particularly the high detection efficiency allows for conducting high quality medical operations with low radiation doses. While today highly-advanced imaging systems are effectively used in the nuclear medicine studies, the use of some conventional counting systems such as thyroid uptake probe are continued effectively. A NaI(Tl) scintillation counter is used in the thyroid uptake probe for detection of radiation and this detector is one of detector types which is very frequently used in the measurement of gamma rays. In this study, some of parameters leading to the efficiency of thyroid uptake probe was measured by taking its significance mentioned above in consideration. The count rate was calculated based on these results and these count rates were compared with the count rates measured.