Determination of the thermal and epithermal neutron sensitivities of an LBO chamber
Determination of the thermal and epithermal neutron sensitivities of an LBO chamber
复制标题
DOI：
10.1007/s00411-017-0700-y
复制
发表时间：
2017-08-01
影响因子：
1.7
通讯作者：
Hoshi, Masaharu
中科院分区：
文献类型：
--
作者：
Endo, Satoru;Sato, Hitoshi;Hoshi, Masaharu
设计了一种LBO （Li2B4O7）壁电离室，用于监测硼中子俘获治疗临床照射中的超热中子通量。利用氘核能量为4 MeV （4 MeV d- be中子）的Be-9（d, n）反应产生的加速器中子，对该装置的热中子和超热中子灵敏度进行了评估。利用金箔活化法测量了热中子和超热中子的影响，并对LBO腔内电荷诱导的腔体响应进行了比较。获得的热中子和超热中子灵敏度以pC cm(2)为单位表示，即由腔室响应除以中子通量（cm(-2)）。测得的LBO室灵敏度对热中子为2.23 × 10(-7) +/- A 0.34 × 10(-7) (pC cm(2))，对超热中子为2.00 × 10(-5) +/- A 0.12 × 10(-5) （pC cm(2)）。这表明LBO腔室对超热中子足够敏感，可用于BNCT辐照的超热中子监测。
An LBO (Li2B4O7) walled ionization chamber was designed to monitor the epithermal neutron fluence in boron neutron capture therapy clinical irradiation. The thermal and epithermal neutron sensitivities of the device were evaluated using accelerator neutrons from the Be-9(d, n) reaction at a deuteron energy of 4 MeV (4 MeV d-Be neutrons). The response of the chamber in terms of the electric charge induced in the LBO chamber was compared with the thermal and epithermal neutron fluences measured using the gold-foil activation method. The thermal and epithermal neutron sensitivities obtained were expressed in units of pC cm(2), i.e., from the chamber response divided by neutron fluence (cm(-2)). The measured LBO chamber sensitivities were 2.23 x 10(-7) +/- A 0.34 x 10(-7) (pC cm(2)) for thermal neutrons and 2.00 x 10(-5) +/- A 0.12 x 10(-5) (pC cm(2)) for epithermal neutrons. This shows that the LBO chamber is sufficiently sensitive to epithermal neutrons to be useful for epithermal neutron monitoring in BNCT irradiation.