用PENELOPE计算NE2571、NE2571A和NE2581A套管电离室的电子束质量$k_{{\rm Q,Q}_0}$因子
Computation of the electron beam quality $k_{{\rm Q,Q}_0}$ factors for the NE2571, NE2571A and NE2581A thimble ionization chambers using PENELOPE
摘要：
计算了NE 2571、NE 2571 A和NE 2581 A三种套管电离室的电子束质量修正因子$k_{Q,Q_{0}}$。Monte Carlo代码PENTHAL PE用于估计这些腔室的总体校正因子$f_{\rm c,Q}$，用于标称能量范围在6和22 MeV之间的电子束，对应于Varian Clinac 2100 C/D。使用$^{60}$ Co光束作为参考质量${\rm Q}_0$。还考虑了8个单能电子束再现质量指数$R_{50}$的Clinac束。$k_{Q,Q_{0}}$因子计算为$f_{\rm c,Q}$和$f_{{\rm c,Q}_0}$之间的比值。NE 2571电离室的计算结果与Muir和Rogers用EGSnrc计算的结果吻合得很好。由于它发生在其他电离室分析在以前的作品中，$k_{{\rm Q,Q}_0}$的因素，发现单能束是大于（小于）比那些对应于Clinac束在低（高）$R_{50}$值，差异略高于$0.5\%$。最后，在NE 2571 A灭菌室中获得的$k_{{\rm Q,Q}_0}$因子系统地比其前身灭菌室NE 2571低约0.5%。
英文摘要：
The quality correction factor $k_{Q,Q_{0}}$ for electron beams was calculated for three thimble ionization chambers, namely, NE2571, NE2571A and NE2581A. The Monte Carlo code PENELOPE was used to estimate the overall correction factor $f_{\rm c,Q}$ of these chambers for electron beams with nominal energies ranging between 6 and 22 MeV, corresponding to a Varian Clinac 2100 C/D. A $^{60}$Co beam was used as reference quality ${\rm Q}_0$. Also eight monoenergetic electron beams reproducing the quality index $R_{50}$ of the Clinac beams were considered. The $k_{Q,Q_{0}}$ factors were calculated as the ratio between $f_{\rm c,Q}$ and $f_{{\rm c,Q}_0}$. Those obtained for the NE2571 ionization chamber show a nice agreement with those calculated by Muir and Rogers with EGSnrc. As it occurred to other ionization chambers analyzed in previous works, the $k_{{\rm Q,Q}_0}$ factors found for the monoenergetic beams are larger (smaller) than those corresponding to the Clinac beams at low (high) $R_{50}$ values, the differences being slightly above $0.5\%$. Finally, the $k_{{\rm Q,Q}_0}$ factors obtained in the case of the NE2571A chamber are systematically ~0.5% below those of its predecessor chamber, the NE2571.
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