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http://dx.doi.org/10.1016/j.net.2017.01.015

Building a Graphite Calorimetry System for the Dosimetry of Therapeutic X-ray Beams  

Kim, In Jung (Korea Research Institute of Standards and Science)
Kim, Byoung Chul (Korea Research Institute of Standards and Science)
Kim, Joong Hyun (Korea Research Institute of Standards and Science)
Chung, Jae-Pil (Korea Research Institute of Standards and Science)
Kim, Hyun Moon (Korea Research Institute of Standards and Science)
Yi, Chul-Young (Korea Research Institute of Standards and Science)
Publication Information
Nuclear Engineering and Technology / v.49, no.4, 2017 , pp. 810-816 More about this Journal
Abstract
A graphite calorimetry system was built and tested under irradiation. The noise level of the temperature measurement system was approximately 0.08 mK (peak to peak). The temperature of the core part rose by approximately 8.6 mK at 800 MU (monitor unit) for 6-MV X-ray beams, and it increased as X-ray energy increased. The temperature rise showed less spread when it was normalized to the accumulated charge, as measured by an external monitoring chamber. The radiation energy absorbed by the core part was determined to have values of $0.798J/{\mu}C$, $0.389J/{\mu}C$, and $0.352J/{\mu}C$ at 6 MV, 10 MV, and 18 MV, respectively. These values were so consistent among repeated runs that their coefficient of variance was less than 0.15%.
Keywords
High Energy X-ray; Absorbed Dose; Graphite Calorimeter; Calorimetry;
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1 J.P. Seuntjens, A.R. Dusautoy, Review of calorimeter based absorbed dose to water standards, in: Proceedings of International Symposium on Standards and Codes of Practice in Medical Radiation, Vienna, Nov. 2002, IAEA-CN-96-3, Vol. 1 (2003) 37-66.
2 J. Witzani, K.E. Duftschmid, Ch. Strachotinsky, A. Leitner, A graphite absorbed-dose calorimeter in the quasi-isothermal mode of operation, Metrologia 20 (1984) 73-79.   DOI
3 A. Ostrowsky, J. Daures, The construction of the graphite calorimeter GR9 at LNE-LNHB, Rapoort CEA-R-6184, LNE-LNHB, 2008.
4 J. Daures, A. Ostrowsky, B. Rapp, Small section graphite calorimeter (GR-10) at LNE-LNHB for measurements in small beams for IMRT, Metrologia 49 (2012) S174.   DOI
5 S. Dufreneix, J.-M. Bordy, J. Daures, F. Delaunay, A. Ostrowsky, Construction of a large graphite calorimeter for measurements in small fields used in radiotherapy, 16th International Congress of Metrology, Paris, Oct. 2013, pp. 1-4.
6 Y. Morishita, M. Kato, N. Takata, T. Kurosawa, T. Tanaka, N. Saito, A standard for absorbed dose rate to water in a 60Co field using a graphite calorimeter at the National Metrology Institute of Japan, Radiat. Prot. Dosim. 154 (2013) 331-339.   DOI
7 S. Picard, D.T. Burns, P. Roger, Determination of the specific heat capacity of a graphite sample using absolute and differential methods, Metrologia 44 (2007) 294-302.   DOI
8 Dupont, Kapton(R) HN technical Data Sheet [Internet].[cited 1 August 2016]. Available from: http://www2.dupont.com/Kapton/en_US/assets/downloads/pdf/HN_datasheet.pdf.
9 J.S. Steinhart, S.R. Hart, Calibration curves for thermistors, Deep-Sea Res. Oceanogr. Abstr. 15 (1968) 497-503.   DOI
10 J.S. Yang, Development of requirements for quality assurance of radiation therapy, 2015 Radiation Security Symposium, Daejeon, 9 Sep. 2015 [in Korean].
11 KINS, Radiation Safety Information System [Internet].[cited July 2016]. Available from: http://rasis.kins.re.kr (in Korean).
12 ICRU, Determination of absorbed dose in a patient irradiated by beams of X or gamma rays in radiotherapy procedures, ICRU Report No. 24, MD, 1976.
13 ICRU, Dosimetry of high-energy photon beams on standards of absorbed dose to water, ICRU Report No. 64, MD, 2001.
14 IAEA, Absorbed dose determination in external beam radiotherapy: an international code of practice for dosimetry based on standards of absorbed dose to water, TRS 398, Vienna, 2000.
15 S.R. Domen, P.J. Lamperti, A heat-loss-compensated calorimeter: theory, design, and performance, J. Res. Natl. Stand. Sect A 78A (1974) 595-610.   DOI
16 S.R. Domen, Advances in calorimetry for radiation dosimetry, in: K.R. Kase, B.E. Bjarngard, F.H. Attix (Eds.), The Dosimetry of Ionizing Radiation, Vol. II, Academic Press, Inc., London, 1985, pp. 245-320.
17 J. Chavaudra, B. Chauvenet, A. Wambersie, Medicine and ionizing radiation: metrology requirements, C.R. Phys 5 (2004) 921-931.   DOI
18 S.H. Lee, Current status and future prospect of regulation for radiation safety in medicine, 2015 Winter meeting of The Korean Association for Radiation Protection, 5 Feb. 2015 (in Korean).
19 M.R. McEwen, D.T. Burns, A.J. Williams, The use of thermistors in the NPL electron-beam calorimeter, NPL Report RSA(EXT) 41, London, 1993.