Earticle

초록

영어

Background: Accidents involving radiographic exposure occur worldwide. During inspection, a large amount of X-ray exposure occurs when the operator is near the source. Therefore, understanding the amount of radiation exposure that can occur in an accident during X-ray work is important. Materials and Methods: X-ray spectra of an X-ray computed tomography (CT) system were measured at 50, 100, and 200 kV. Gafchromic film external beam therapy 4 (EBT4) was used to measure direct X-rays from the Be window of the X-ray CT. Directed and scattered X-ray doses were evaluated using a thermoluminescent dosimeter (TLD-100H) (Thermo Fisher Scientific Inc.). Results and Discussion: Characteristic L-X-ray emitted from the tungsten filament of an X-ray CT machine were observed at 8–10 keV in an open-tube X-ray CT system without a metal filter. The dose rate of personal dose equivalent at a depth of 0.07 mm (Hp(0.07)) was 2.0 Sv/min at 3.7 cm from the X-ray source. The results of Hp(10) for the direct and scattered X-rays showed that the maximum was 7.5 mSv/min. Conclusion: It is important to note that exposure levels can become extremely high if work is performed near an X-ray source without realizing that X-rays are being emitted. We recommend the use of interlock functions and alarm-type personal dosimeters to prevent accidental exposure.

목차

ABSTRACT
Introduction
Materials and Methods
1. X-Ray Spectrometry Using a CdTe Semiconductor Detector
2. Measurement of the Direct X-Ray Dose
3. Measurement of the Directed and Scattered X-Rays Except for the Energy of 10 keV
Results and Discussion
1. X-Ray Spectra
2. Measurement of Dose from Direct X-Rays with EBT4
3. Dose Distribution of Directed and Scattered X-Rays with TLD-100H
Conclusion
Article Information
References

키워드

저자

• Noriaki Kataoka [ Tokyo Metropolitan Industrial Technology Research Institute, Tokyo, Japan ] Corresponding Author
• Tomoya Tsuji [ Nuclear Science Research Institute, Japan Atomic Energy Agency, Ibaraki, Japan ]
• Yuki Takimoto [ Tokyo Metropolitan Industrial Technology Research Institute, Tokyo, Japan ]
• Munehiko Kowatari [ National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  방사선방어학회지 [Journal of Radiation Protection and Research]

• 간기

  계간

• pISSN

  2508-1888

• 수록기간

  1976~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 559 DDC 629