S Sina - Radiation Research Center, Shiraz University, Shiraz, Iran
B Zeinali
M Karimipoorfard
F Lotfalizadeh
M Sadeghi
E Zamani
R Faghihi

Background: Dose assessment using proper dosimeters is especially important in radiation protection optimization and imaging justification in diagnostic radiology.Objective: The aim of this study is to obtain the Entrance Skin Dose (ESD) of patients undergoing lumbar spine imaging using two thermoluminescence dosimeters TLD-۱۰۰ (LiF: Mg, Ti) and GR-۲۰۰ (LiF: Mg, Cu, P) and also to obtain the absorbed dose to different organs in lumbar spine imaging with several views.Methods: To measure the ESD values of the patients undergoing lumbar spine imaging, the two TLD types were put on their skin surface. The ESD values for different views of lumbar spine imaging were also measured by putting the TLDs at the surface of the Rando phantom. Several TLD chips were inserted inside different organs of Rando phantom to measure the absorbed dose to different organs in lumbar spine imaging.Results: The results indicate that there is a close agreement between the results of the two dosimeters. Based on the results of this experiment, the ESD dose of the ۱۶ patients included in this study varied between ۲.۷۱ mGy and ۲۶.۲۹ mGy with the average of ۱۱.۸۹ mGy for TLD-۱۰۰, and between ۲.۵۵ mGy and ۲۷.۴۱ mGy with the average of ۱۲.۳۲ mGy for GR-۲۰۰ measurements. The ESDs obtained by putting the two types of TLDs at the surface of Rando phantom are in close agreement.Conclusion: According to the results, the GR۲۰۰ has greater sensitivity than the TLD-۱۰۰.

Entrance Skin Dose, TLD-۱۰۰, Rando phantom