The purpose of this study is an assessment between the measured value of the nanoDot dosimeter and the calculated value of Non Dosimeter Dosimetry-Method(NDD-M) for entrance surface dose in general radiography. Measurement and calculation of the entrance surface doses were performed for head(AP), abdomen(AP), pelvis(AP), thoracic spine(AP) and lumbar spine(AP). As a result, the relative ratios of the measured value to the calculated value were acquired 1.5-2.1 for each region. Reproducibility acquired 0.035 as a coefficient of variation.

It is necessary for patients to wait twice for the thyroid examination of thyroid uptake measurement and thyroid scan by using 99m Tc-pertechnetate. In the study, a method of simultaneous examination of thyroid uptake measurement and thyroid scan by one intravenous injection of 99m Tc-pertechnetate was suggested by using attenuation filter. As a result, there was a signigicant correlation between control group and experimental group according to existence of attenuation filter. Consequently, the simultaneous examination of thyroid uptake measurement and thyroid scan by one intravenous injection can be applied clinically.

The purpose of this study is(was) to investigate the shielding ratio of 1 ㎜Pb and the off axis ratio outside the field edge at depth of 1 ㎝ from a phantom surface for 6 MV photon beam. A dose of 180 cGy was delivered to a depth of 10 ㎝ for a 10×10 ㎠ and 15×15 ㎠ field in the SAD technique. The off axis ratio was calculated by measuring the dose of optically stimulated luminescent nanoDot dosimeters(OSLnDs) positioned at 2, 4 and 6 ㎝ from the field edge, and the center axis of field. And the shielding ratio of 1 ㎜Pb was calculated by measuring the dose of OSLnDs positioned at 2, 4 and 6 ㎝ from the field edge.. As a result, for a 10×10 ㎠ and 15×15 ㎠ field, the off axis ratios were acquired 0.008-0.023 and 0.011-0.028, respectively. Also the shielding ratios of 1 ㎜Pb were acquired 0.868-0.888 and 0.807-0.842, respectively. These results provide data to protect organs at risk outside the radiation treatment field.