关键词: 
⁷Li离子 /
高LET辐射 /
束斑均匀性 /
注量准确性

摘要: 7Li离子属于高LET辐射，是辐射生物学基础研究中常用的重离子射线之一，它是硼中子俘获治疗癌症中起关键作用的离子，在辐射诱变育种等领域也有较好的应用前景。实验在北京HI-13串列加速器R20支线生物用新终端上进行，对43 MeV 7Li离子束斑大小、均匀性和监测注量的准确性进行测量和评估，结果表明：均匀性好于90%的最大束斑面积为5.0cm×5.0cm；4.2×10⁴ ～1.5×10⁵ particles/cm²/s注量率范围内，两种不同探测器测得的注量率变化呈线性关系，闪烁体探测器监测的注量与CR39探测器测得的绝对注量的误差小于10%。这些束流特性能够满足辐射生物学实验要求，有利于进一步开展与硼中子俘获治疗癌症或辐射诱变育种中7Li离子的辐射生物学相关研究。

⁷Li ion with high linear energy transfer (LET) radiation has been used in radiobiological research, takes main effect in Boron Neutron Capture Therapy and is applied in radiation mutagenic breeding. This experiment was carried on the new terminal established for radiobiological application, located at the end of R20 branch beam line of HI-13 tandem accelerator. The beam qualities of 7Li ions of 43MeV generated by HI-13 tandem accelerator, including spot size and uniformity and particle fluence accuracy were measured using different detection methods. The results showed that beam uniformity was over 90% at 5cm×5cm area, the flux of S1 and M3 had a good linear relationship as particle flux ranged from 4.2×104 particles/cm2/s to 1.5×105 particles/cm2/s, and particle fluence accuracy was better than 90%. All the results showed that the beam qualities of 7Li ions finely met the basic requirements for radiation biological experiment. It provides important method to study biological effects for fundamental research and tumor therapy or radiation mutagenic breeding application associated with ⁷Li ions.