Comparison of titanium hydride (TiH2) and paraffin as neutron moderator material in a prompt gamma scanning system
- Authors
- Seo, Kyu Seok; Kim, Chan Hyeong; Kim, Jong Won
- Issue Date
- Apr-2006
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- proton therapy; prompt gammas; Monte Carlo; neutrons; dosimetry
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.48, no.4, pp.855 - 858
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 48
- Number
- 4
- Start Page
- 855
- End Page
- 858
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/181622
- ISSN
- 0374-4884
- Abstract
- If the proton therapy modality allowing excellent dose localization to the tumor volume and negligible exit dose in the patient is to be taken advantage of, a proper dosimetry system is required. We have recently designed a prompt-gamma scanning system to measure the proton range in situ by using a Monte Carlo technique employing MCNPX, FLUKA, and Sabrina (TM). The gamma scanning system was designed to measure only the right-angled prompt gammas passing through a narrow collimation hole in order to correlate the position with the dose distribution. The collimation part of the scanning system, which has been constructed to measure the gammas at a 70-MeV proton energy, is made of a set of paraffin, berated carbon, and lead layers to shield the high-energy neutrons and secondary photons. However, in this study, we tried a titanium-hydride (TiH2) layer instead of the paraffin to reduce the background radiation. Our result shows that titanium hydride gives a better result when the distance between the phantom and the gamma scanner is short.
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