Microfluidic Chip Calorimeter for Small-Field Radiation Dosimetry

Jonghyun Kim, Sung Min Nam, Jihye Kim, Yo Na Choi, Tae Hoon Kim, Kook Jin Chun, Hyun Tai Chung, Wonhee Lee

Research output: Contribution to journalArticle


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.

Original languageEnglish
Article number8963937
Pages (from-to)5165-5175
Number of pages11
JournalIEEE Sensors Journal
Issue number10
StatePublished - 15 May 2020



  • Chip calorimeter
  • miniaturized dosimeter
  • nanofabrication
  • small field radiation dosimetry

Cite this

Kim, J., Nam, S. M., Kim, J., Choi, Y. N., Kim, T. H., Chun, K. J., Chung, H. T., & Lee, W. (2020). Microfluidic Chip Calorimeter for Small-Field Radiation Dosimetry. IEEE Sensors Journal, 20(10), 5165-5175. [8963937]. https://doi.org/10.1109/JSEN.2020.2968189