Program Information
Evaluation of a Smartphone-Connected Semiconductor Detector for Individual Exposure in Medical Field
T Fujibuchi1*, K Terasaki2 , Y Ishigaki3 , Y Matsumoto4 , (1) Kyushu University, Fukuoka, Fukuoka, (2) Kyushu University, Fukuoka, Fukuoka, (3) The University of Electro-Communications, Chofu, Tokyo, (4) Keio University, Yokohama, Kanagawa
Presentations
SU-H2-GePD-I-1 (Sunday, July 30, 2017) 3:30 PM - 4:00 PM Room: Imaging ePoster Lounge
Purpose: Recently, Interventional Radiology (IVR) has been implemented for various diseases. In the IVR, occupational exposure by X-ray irradiation is feared. The medical staff can grasp the exposure dose by attaching personal dosimeter such as thermos luminescence dosimeter (TLD). However, TLD can not grasp the value in real time. In this research, we developed a smartphone connected type semiconductor detector for monitoring the personal exposure of medical staff in real time. We constructed a radiation field assuming the actual clinical site and evaluated the characteristics of the detector.
Methods: We used the diagnostic X-ray generator and evaluated the energy, dose rate, and dose characteristics of a semiconductor detector (sensor: VBPW 34 FAS). The tube voltage of the X-ray source was from 60 to 120 kV. In the dose rate characteristic, we evaluated with two types of reverse bias voltage sensors (Vr = 3, 30 V). The energy characteristics were evaluated using several metal filters (Aluminum, Tin, Brass and Cupper) for the purpose of compensating the energy dependence of the detector. Response characteristics were evaluated by comparing detector counts and individual dose equivalents.
Results: By attaching a 1 mm thickness Al filter on the sensor, it showed a response of 1.0 - 1.2 times the theoretical value of the individual dose equivalent. About dose rate characteristic, linearity was confirmed in the dose rate range from 1.3 to 200 mSv/h. By increasing the reverse bias voltage by 10 times, the sensitivity has increased by nearly ten times. Dose characteristics showed linearity.
Conclusion: Smartphone connected type semiconductor detector was able to be used for monitoring of medical staff in radiation field such as IVR.
Funding Support, Disclosures, and Conflict of Interest: This research is supported by the Matching planner Program No. YYN5032 from Japan. Science and Technology Agency, JST. This research is supported by the Matching planner Program No. MP28116808209 MP from Japan.
Contact Email: