0.1ml電離箱を用いた電子線平均入射エネルギーの測定 : 任意電離箱の吸収線量変換係数C_Eの検討

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For in determining the mean incident energy of electron beams(E^^__0), we have to get percentage depth dose(PDD) and for this, we also have to spend a great deal of time collecting data and Carrying out calculations. Using the water phantom system and the 0.1 ml ionization chamber, if it is possible to calculate E^^__0 according to the JARP protocol, we were able to come up with an efficient calculating system. We have developed an application program for calculating E^^__0 in according to the JARP protocol by taking raw data of the water phantom system, and study calculating the absorbed dose conversion factors of electron beams(C_E)in all ionization chambers with mean energy in water(E^^__d)and water/air mean restricted collision mass stopping power ratio(L^^_/ρ)_<w, a> of E^^__0. After comparing the measurements between the 0.1 ml ionization chamber, 0.6 ml ionization chamber and shallow ionization chamber, both PDD and E^^__0 agree with the measurement errors. So that it is quite possible to measure E^^__0 by using a 0.1 ml ionization chamber. C_E of 0.6 ml and shallow ionization chamber which already had calculated E^^__d and(L^^_/ρ)_<w, a> of 0.1 ml ionization chamber show errors within 0.53% as compared with C_E of 0.6 ml and shallow ionization chamber. However calculating of C_E can not eliminate the physical erros, because the P_f formula is an approximate formula due to the use of(L^^_/ρ)_<w, a> of ⊿=10 keV, but we thought that change of C_E for fluctuations in E^^__0 could be confirmed.
公益社団法人日本放射線技術学会の論文
1995-06-01

0.1ml電離箱を用いた電子線平均入射エネルギーの測定 : 任意電離箱の吸収線量変換係数C_Eの検討

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