SU‐E‐I‐09: Application of LiF:Mg,Cu (TLD‐100H) Dosimeters for in Diagnostic Radiology

Abstract

Purpose:Accurate dosimetery is very essential in diagnostic radiology. The goal of this study is to verify the application of LiF:Mg,Cu,P (TLD100H) in obtaining the Entrance skin dose (ESD) of patients undergoing diagnostic radiology. The results of dosimetry performed by TLD‐100H, were compared with those obtained by TLD100, which is a common dosimeter in diagnostic radiology.Methods:In this study the ESD values were measured using two types of Thermoluminescence dosimeters (TLD‐100, and TLD‐100H) for 16 patients undergoing diagnostic radiology (lumbar spine imaging). The ESD values were also obtained by putting the two types of TLDs at the surface of Rando phantom for different imaging techniques and different views (AP, and lateral). The TLD chips were annealed with a standard procedure, and the ECC values for each TLD was obtained by exposing the chips to equal amount of radiation. Each time three TLD chips were covered by thin dark plastic covers, and were put at the surface of the phantom or the patient. The average reading of the three chips was used for obtaining the dose.Results:The results show a close agreement between the dose measuered by the two dosimeters.According to the results of this study, the TLD‐100H dosimeters have higher sensitivities (i.e.signal(nc)/dose) than TLD‐100. The ESD values varied between 2.71 mGy and 26.29 mGy with the average of 11.89 mGy for TLD‐100, and between 2.55 mGy and 27.41 mGy with the average of 12.32 mGy for measurements.Conclusion:The TLD‐100H dosimeters are suggested as effective dosimeters for dosimetry in low dose fields because of their higher sensitivities.