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Feasibility Test of Flat-Type Faraday Cup for Ultrahigh-Dose-Rate Transmission Proton Beam Therapy
Sang-il Pak,Sungkoo Cho,Seohyeon An,Seonghoon Jeong,Dongho Shin,Youngkyung Lim,Jong Hwi Jeong,Haksoo Kim,Se Byeong Lee Korean Society of Medical Physics 2022 의학물리 Vol.33 No.4
Purpose: Proton therapy has been used for optimal cancer treatment by adapting its Bragg-peak characteristics. Recently, a tissue-sparing effect was introduced in ultrahigh-dose-rate (FLASH) radiation; the high-energy transmission proton beam is considered in proton FLASH therapy. In measuring high-energy/ultrahigh-dose-rate proton beam, Faraday Cup is considered as a dose-rate-independent measurement device, which has been widely studied. In this paper, the feasibility of the simply designed Faraday Cup (Poor Man's Faraday Cup, PMFC) for transmission proton FLASH therapy is investigated. Methods: In general, Faraday cups were used in the measurement of charged particles. The simply designed Faraday Cup and Advanced Markus ion chamber were used for high-energy proton beam measurement in this study. Results: The PMFC shows an acceptable performance, including accuracy in general dosimetric tests. The PMFC has a linear response to the dose and dose rate. The proton fluence was decreased with the increase of depth until the depth was near the proton beam range. Regarding secondary particles backscatter from PMFC, the effect was negligible. Conclusions: In this study, we performed an experiment to investigate the feasibility of PMFC for measuring high-energy proton beams. The PMFC can be used as a beam stopper and secondary monitoring system for transmission proton beam FLASH therapy.
Pilot Study on Microwave Dryer for Dehydration of Sewage Sludge Cake
Myung Seop Shin,Yong-Woo Jeon,Seohyeon Pak,Hyun-Jung Kim 한국폐기물자원순환학회 2015 한국폐기물자원순환학회 학술대회 Vol.2015 No.05
Dewatering for reduction of moisture content in sludge cake is one of the main procedure in sludge treatment processing. Through dehydration process, the volume of sludge cake are substantially decreased. It led efficiency improvement of further processing such as transport and disposal of sludge as well as drying cake could be utilized as solid refuse fuel. Microwave dryer is energy efficient process in comparison with thermal types. For these reason, we developed microwave dryer for real field applications. Firstly, with 4kW scale microwave dryer, operation conditions were optimized in terms of generator power, shape of drying champer, and height of microwave generator. Based on the results, 10kW scale microwave dryer was designed and manufactured successfully.
Pilot Study on Microwave Dryer for Dehydration of Sewage Sludge Cake
( Myung Seop Shin ),( Yong-woo Jeon ),( Seohyeon Pak ),( Hyun-jung Kim ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2015 No.-
Dewatering for reduction of moisture content in sludge cake is one of the main procedure in sludge treatment processing. Through dehydration process, the volume of sludge cake are substantially decreased. It led efficiency improvement of further processing such as transport and disposal of sludge as well as drying cake could be utilized as solid refuse fuel. Microwave dryer is energy efficient process in comparison with thermal types. For these reason, we developed microwave dryer for real field applications. Firstly, with 4kW scale microwave dryer, operation conditions were optimized in terms of generator power, shape of drying champer, and height of microwave generator. Based on the results, 10kW scale microwave dryer was designed and manufactured successfully.