Measuring radiation dose in a mixed radiation field cannot be performed by using only one dosimeter, but a pair of dosimeters, TLD600 and TLD700 can be successfully used to estimate that radiation dose. Therefore, in the present study, the response of TLD600 and TLD700 to neutron/gamma mixed radiation field was deeply discussed. Moreover, the sensitivity and stability of TLD600 and TLD700 were studied. A strong correlation between TL output signal intensity of TLD700 to gamma dose appeared, with a linear coefficient of R 2 = 0.99. Likewise, a strong correlation between TL output signal intensity of TLD600 to gamma dose and neutron irradiation was also evident, with a linear coefficient of R 2 = 0.99. Thus, TLD700 can be applied to measure gamma dose with good sensitivity, while TLD600 can be applied to measure both gamma and neutron dose. Hence, a combination of TLD700 and TLD600 can be successfully employed to assess the radiation doses characterizing a mixed radiation field of neutron and gamma rays.

Radiation protection in pediatric radiology deserves special attention due to the fact that children are more sensitive to radiation than the adults. This study is concerned with the measurements of pediatric entrance surface dose (ESD) using thermo-luminance dosimeter (TLD, LIF100) for patients ranging from age intervals: 0.1-5 years, 5-10 years and 10-16 years, respectively. A central public pediatric hospital and 120 Egyptian patients were included in this investigation. By careful selection of the patients, three types of simple radiography were selected, as follows: (50 to the chest, 35 to the abdomen and 35 to the skull). Pediatric chest examinations are the most frequent radiological examinations. Comparisons were performed between these doses and the diagnostic reference levels (DRLs). The results showed that mean patient skin doses measured with TLD for the patients ranging from 10-16 years old were 0.20 mGy 14%, 1.10 mGy 23% and 1.00 mGy 40% for chest, abdomen and skull examination, respectively. The mean ESD values were found to be within the range of ESD reference values, except those for the chest examination.