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KMID : 0861420100140020159
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Korean Journal of Nuclear Medicine Technology
2010 Volume.14 No. 2 p.159 ~ p.165
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A Study to Decrease Exposure Dose for the Radiotechnologist in PET/CT
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Cho Seok-Won
Park Hun-hee
Kim Jung-Yul
Bahn Young-Kag
Lim Han-Sang
Oh Ki-Beak
Kim Jae-Sam
Lee Chang-Ho
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Abstract
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Purpose: Positron emission tomography scan has been growing diagnostic equipment in the development of medical imaging system. Compare to 99mTc emitting 140 keV, Positron emission radionuclide emits 511 keV gamma rays. Because of this high energy, it needs to reduce radioactive emitting from patients for radiotechnologist. We searched the external dose rates by changing distance from patients and measure the external dose rates when we used shielder investigate change external dose rates. In this study, the external dose distribution were analyzed in order to help managing radiation protection of radiotechnologists.
Materials and Methods: Ten patients were searched (mean age: 47.7±6.6, mean height: 165.5±3.8 cm and mean weight:
65.9±1.4 kg). Radiation were measured on the location of head, chest, abdomen, knees and toes at the distance of 10, 50, 100, 150 and 200 cm. Then, all the procedure was given with a portable radiation shielding on the location of head, chest and abdomen at the distance of 100, 150 and 200 cm and transmittance was calculated.
Results: In 10 cm, head (105.40 μSv/h) was the highest and foot (15.85 μSv/h) was the lowest. In 200 cm, head, chest and abdomen showed similar. On head, the measured dose rates were 9.56 μSv/h, 5.23 μSv/h, and 3.40 μSv/h in 100, 150 and 200 cm respectively. When using shielder, it shows 2.24 μSv/h, 1.67 μSv/h, and 1.27 μSv/h in 100, 150 and 200 cm on head. On chest, the measured dose rates were 8.54 μSv/h, 4.90 μSv/h, 3.44 μSv/h in 100, 150 and 200 cm, respectively. When using shielder, it shows 2.27 μSv/h, 1.34 μSv/h, and 1.13 μSv/h in 100, 150 and 200 cm on chest. On abdomen, the measured dose rates were 9.83 μSv/h, 5.15 μSv/h and 3.18 μSv/h in 100, 150 and 200cm respectively. When using shielder, it shows 2.60 μSv/h, 1.75 μSv/h and 1.23 μSv/h in 100, 150 and 200 cm on abdomen. Transmittance was increased as the distance was expanded.
Conclusion: As the distance was further, the radiation dose were reduced. When using shielder, the dose were reduced as one-forth of without shielder. The Radio technologists are exposed of radioactivity and there were limitations on reducing the distance with Therefore, the proper shielding will be able to decrease radiation dose to the radiotechnologists.
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KEYWORD
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PET, Shielding, Dose rate
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