The field of cosmic radiation at low-Earth orbit (LEO) has a complex composition. It always contains a component of secondary charged particles, formed by the products of nuclear interactions of the primary high-energy radiation with the nuclei of spacecraft’s shielding material, electronic components and biological matter on board. Generation of this secondary radiation can be observed in some track detectors in the form of “stars” formed by tracks—fragments with a common vertex. The energy absorbed by the medium in the region adjacent to the interaction vertex can reach abnormally high values because of its intersection by several particle fragments. In the present paper, a methodology is considered to calculate the energy imparted by such fragments to a spherical sensitive volume in an aqueous medium. The energy distributions for three fragment events were calculated for different positions of the vertex relative to the spherical volume. The obtained data were analyzed and were compared with the distribution for a uniform fluence of secondary particles. It was shown that as the fragmentation vertex approaches the boundary of the sensitive micro-volume, the probability of events with anomalously high energy transfers, higher than the energies from single fragments, increases. The method can be applied to calculate absorbed energy distributions from secondary radiation in media of different elemental composition than that used in the present work. In the future, it is of interest to apply the method for example to study the energy imparted from secondary fragments to a silicon medium, to quantify the number of single event upsets in electronic components.

近地轨道（LEO）的宇宙辐射场具有复杂的组成。它总是含有次级带电粒子的成分，是由初级高能辐射与航天器屏蔽材料、电子元件和船上生物物质的核相互作用的产物形成的。这种二次辐射的产生可以在一些轨道探测器中以由轨道（具有共同顶点的碎片）形成的“星”的形式观察到。由于多个粒子碎片相交，相互作用顶点附近区域的介质吸收的能量可能达到异常高的值。在本文中，考虑了一种方法来计算此类碎片赋予水性介质中的球形敏感体积的能量。计算了顶点相对于球体体积的不同位置的三个碎片事件的能量分布。对获得的数据进行分析并与二次粒子的均匀注量的分布进行比较。结果表明，当碎片顶点接近敏感微体积的边界时，具有异常高能量转移（高于单个碎片的能量）的事件的概率会增加。该方法可用于计算与本工作中使用的元素成分不同的介质中二次辐射的吸收能量分布。未来，人们感兴趣的是应用该方法来研究从次级碎片传递到硅介质的能量，以量化电子元件中单粒子翻转的数量。