Earticle

초록

영어

When the PDD (percentage depth dose) in the megavoltage beams is measured in the water phantom, the polarity and ionrecombination effects of ionization chambers with depth in water are not usually taken into consideration. We try toinvestigate if those variations with depth should be taken into consideration or could be ignored for the thimble type semi-flex ionization chamber (PTW 31010TM, SN 1551). According to the recommendation of IAEA TRS-398, the 4 representativedepths of ds, dmax, d90and d50were used for the electron beams. For the photon beams, the 4 depths were arbitrarily chosenfor the photon beams, which were ds, dmax, d10and d20. For the high energy photon beam both polarity and ion recombinationfactors of the chamber with depth in water gives the good agreements within the maximum ±0.2%, while the Cpols withdepth came within the maximum ± 0.4% and the CIRs within the maximum ±0.6% in every electron beam used. This studyshows that PDI (percentage depth ionization) could be a good approximation to PDD for the chamber used.

목차

abstract
 I. INTRODUCTION
 2. THEORY AND METHODS
  2.1 The Percentage Depth Dose Curve PDD fromthe Depth Ionization Curve PDI
  2.2 The Correction of the Polarity and IonRecombination Effects
  2.3 Experimental Setup
 3. RESULTS AND DISCUSSION
 4. CONCLUSION
 REFERENCES

키워드

저자

• SEONGHOON KIM [ Department of Radiation Oncology, Hanyang University Hospital ]
• HYUNDO HUH [ Department of Radiation Oncology, Inhwa University Hospital ]
• SANGHYUN CHOI [ Department of Radiation Oncology, Inhwa University Hospital ]
• CHUL HEE MIN [ Department of Nuclear Engineering, Hanyang University ]
• DONGOH SHIN [ Department of Radiation Oncology, KyungHeeUniversity Hospital, ]
• JINHO CHOI [ Gachon University of Medicine and Science ] Corresponding author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  방사선방어학회지 [Journal of Radiation Protection and Research]

• 간기

  계간

• pISSN

  2508-1888

• 수록기간

  1976~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 559 DDC 629