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首页> 外文期刊>Physics in medicine and biology. >Can heavy charged particles really be regarded as high-LET radiations with respect to their radiobiological actions? I: LETs and fluences of heavy charged particles and associated delta-rays.
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Can heavy charged particles really be regarded as high-LET radiations with respect to their radiobiological actions? I: LETs and fluences of heavy charged particles and associated delta-rays.

机译：就其放射性生物学行为而言，重带电粒子真的可以被视为高LET辐射吗？ I：重电荷粒子和相关的德尔塔射线的LET和通量。

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摘要

The structures of the energy transfer of heavy charged particles (HCP) to nm-size targets have been investigated, taking account of delta-ray generation by HCP as well as associated delta-rays. From the microdosimetric viewpoint, the radiobiological effects of HCP have to be analysed in terms of the microdosimetric quantities based on the local energy transfer (LET) to the target, that is the restricted linear energy transfer (Ldelta), and the fluences or the degradation spectra of charged particles including delta-rays. Ldelta of HCP and delta-rays, and the fluences of delta-rays have been calculated for various HCP (H-Ar) with energies 1, 10 and 100 MeV amu(-1). From the results obtained, it is concluded that heavy ions (HI) should be expressed as two-component radiations which are composed of high-Ldelta heavy ion tracks of low fluence and low-Ldelta delta-rays of high fluence; in other words, the currently used expression 'HI are high-LET radiations' is not valid.
机译：已经研究了重电荷粒子（HCP）到纳米尺寸目标的能量转移结构，同时考虑到了HCP产生的德尔塔射线以及相关的德尔塔射线。从微剂量学的角度来看，必须根据到目标的局部能量转移（LET），即受限制的线性能量转移（Ldelta），以及注量或降解，根据微量剂量来分析HCP的放射生物学效应。带电粒子的光谱，包括德尔塔射线。 HCP和δ射线的Ldelta值，以及δ射线的通量已经针对能量为1、10和100 MeV amu（-1）的各种HCP（H-Ar）进行了计算。从获得的结果可以得出结论，重离子（HI）应表示为由低通量的高Ldelta重离子迹线和高通量的低Ldeltaδ射线组成的两成分辐射;换句话说，当前使用的表达式“ HI是高LET辐射”无效。

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