Microfluidic Chip Calorimeter for Small-field Radiation Dosimetry

Recent advances in medical radiation technologies have enabled small field radiotherapy with a beam size as small as a few millimeters for precise dose delivery to patients. However, conventional radiation dosimeters for small field radiotherapy suffer from inaccurate dose measurements due to their...

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Bibliographic Details
Published in:IEEE sensors journal 2020-05, Vol.20 (10), p.1-1
Main Authors: Kim, Jonghyun, Nam, Sung Min, Kim, Jihye, Choi, Yo-na, Kim, Tae Hoon, Chun, Kook Jin, Chung, Hyun-Tai, Lee, Wonhee
Format: Article
Language:English
Subjects:
Absorbers
Chip calorimeter
Compensation
Dosimeters
Dosimetry
Electric heating
Heating systems
Light sources
Microfluidics
Miniaturized dosimeter
Nanofabrication
Photoresists
Radiation detectors
Radiation dosage
Radiation therapy
Semiconductor device measurement
Small field radiation dosimetry
Temperature measurement
Temperature sensors
Thermistors
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Summary:Recent advances in medical radiation technologies have enabled small field radiotherapy with a beam size as small as a few millimeters for precise dose delivery to patients. However, conventional radiation dosimeters for small field radiotherapy suffer from inaccurate dose measurements due to their large absorber size. Herein, we present a nanofabricated chip calorimeter as a new platform for a miniaturized dosimeter for measurements of the absorbed dose. The calorimeter consists of a microscale absorber body built with a SU-8 photoresist and a microfluidic water container. The measurement system was constructed such that the calorimeter operates in the heat compensation mode, where the temperature change of the absorber was proportional to the absorbed energy. The operability of the heat compensation calorimeter was examined with electric heating and a visible light source. The feasibility of application of the microfluidic chip calorimeter for medical radiation sensor was successfully demonstrated by measuring the absorbed dose from the small radiation field of the Gamma Knife.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2020.2968189