작성일 : 23-05-16 15:37
A new real-time personal dosimeter with position monitoring based on a scintillator
|
|
글쓴이 :
관리자
조회 : 430
|
Personal
dosimeters are used to measure the amount of radiation exposure in individual
radiation workers. We aimed to replace existing personal dosimeters and
evaluate a real-time scintillator-based dosimeter by monitoring its radiation
dose and checking the location exposed to radiation in the workspace. The
developed dosimeter measured the radiation dose based on a scintillating fiber
(SF) bundle, and comprised a silicon photomultiplier (SiPM), ultra-wide-band
(UWB)-based location detecting system, and Bluetooth system. The SF bundle was
exposed to radiation-emitted light, and the photons were amplified and
converted to electrical signals through the SiPM. These signals were
transferred to the user through the Bluetooth system and monitored. To evaluate
the feasibility of this mechanism as a dosimeter, we performed characteristic
tests, such as dose linearity, dependence on dose rate, energy, exposed angle,
and location coordinate mapping. Also, the dose distribution formed in circles
around the iso-center was measured to confirm the feasibility of monitoring the
exposure dose and location and to enable the radiation worker to move freely in
a workspace. We confirmed dose linearity, independence from energy and angle,
and accuracy of location monitoring in our device. The user’s locations were
measured with a difference of − 6 cm and − 4.8 cm on the x- and the y-axes, respectively. The
measured doses on our developed dosimeter were 62.7, 32.3, 21.0, and 15.4 mSv
at distances of 50, 100, 150, and 200 cm from the iso-center. In other words,
all measured doses at several points showed an error within 5% as compared to
doses provided by the conventional pocket dosimeter. These results show that
the developed SF-based dosimeter is advantageous in monitoring the exposure
dose and location in real time, and has significant potential as a new personal
dosimeter for radiation
workers.
Sun Young Moon, Myonggeun Yoon
Department of Bio-Convergence
Engineering, Korea University, Seoul, South Korea
Sun-Young Kim, Dongho Shin
Proton Therapy Center, National Cancer
Center, Goyang, South Korea
J.
Korean Phys. Soc. 78, 1133–1140 (2021).
|
|