Ionizing radiation is often used for imaging in health applications. One of them is scintigraphic method. one of the radiation emitters used in nuclear medicine is technesium-99m (Tc-99m). This isotope releases gamma rays at about the same wavelength as conventional X-ray diagnostic equipment, with 140 keV gamma ray energy which has a ideal short half-life (t ½ = 6 h) for diagnostic nuclear imaging. Before imaging, the patient is injected with Tc-99m. After injecting Tc-99m, the patient begins to emit radiation to the environment. Determination of this radiation dose emitted by the patient is very important for public health. The main objective of this study was to determine the environmental radiation doses in patients undergoing Tc-99m DMSA cortical renal scintigraphy. In this study, the radiation dose rate emitted by the patient about 5, 35 and 68 minutes after Tc-99m injection was measured at different distances from the patient. As a result of this study, the mean radiation dose at 5.07, 35.60 and 68.57 minutes after injection was found to be 5.06 µSvh-1 , 4.76 µSvh-1 and 4.18 µSvh-1 at a distance of 100 cm from the patient's chest level, respectively. The results are important in terms of knowing the radiation dose to which the patient will be exposed.

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Today, many imaging tools have emerged in the medical field using ionizing radiation. Computed tomography (CT) is regarded the most creative and common modality among the other imaging devices. In CT imaging, radiation may scatter to the environment from the patient and the interaction medium. In this study, two CT scanners with different slice numbers were used to measure the scatter radiation dose to the environment. Alderson rando phantom was utilized in the acquired CT exams as human body simulation. Radiation dose levels at different distances were determined by placing thermoluminescence dosimeters in the surrounding environment (at different distances) during phantom's head-neck and thorax CT imaging. As a result, it has been found that the radiation dose varies between 13.90±1.96 µSv and 96.79±11.12 µSv in head and neck CT imaging. While, in thorax CT scan, the radiation dose varies between 5.28±0.84 µSv and 20.63±1.76 µSv.

Baş ve boyun bilgisayarlı tomografi (BT) görüntülemesi, en sık kullanılan radyolojik incelemelerinden biridir. Birçok hastalığın tanısında önemli rol oynar. Lens ve tiroid bezi radyasyona karşı en duyarlı organlardandır. Bu çalışmanın amacı, BT görüntülemesi yapıl an hastaların, lens, oral mukoza ve tiroid dokusunun maruz kaldığı radyasyon dozunun belirlenmesidir. Yöntem: Çalışmada, insan eşdeğeri olan Alderson Rando fantomunun tiroid, oral mukoza, lens bölgelerine termolüminesans dozimetreleri (TLD) yerleştirilmiş ve fantomun baş-boyun bölgesinin BT görüntülemesi yapılmıştır. Toplam 18 adet TLD kullanılmıştır. Öncelikle dozimetrelerin kalibrasyon işlemleri yapılmıştır. Bu dozimetrelerden 6 tanesi fantomun tiroid bölgesine, 4 tanesi oral mukozaya, 4 tanesi de lens bölgesine yerleştirilmiştir. 4 tane dozimetre ise arkaplan (background) ölçümleri için kullanılmıştır.

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