Establishment of Database of CR-39 Track Detector Response to Light Ions

固体核径迹探测器(SSNTD)在航天飞机上的人员个人剂量测量、激光等离子体中发射的带电粒子的分离测量等许多研究领域都显示出其独特的特点。对于这种应用来说，利用SSNTDS对带电粒子的基本响应的明确定义的数据是必不可少的。然而，目前仍然存在一个严重的问题，即没有共同的数据库。本研究的主要目的是通过对法国法兰西大学、德国德累斯顿工业大学和日本神户商船大学之间的国际比较，建立一个可靠的轻离子数据库。首先，对1999年获得的质子(P)、质子(D)、中子(T)和α粒子(α)的数据进行了核对和汇编，其中包括一些新的实验数据。经过能量为4.8、6.8和10.8 MeV的锂离子(Li)辐照的CR-39样品分布在三个小组中，其中包括然后独立处理和分析。所有数据都与每个团队的数据一致。我们还发现，响应函数对入射能量略有依赖。最后，在2002年对CR-39探测器对高达22.5 MeV的碳离子的响应进行了评估。三个团队之间的偏差扩大了，特别是在离子轨迹的终点附近。这可能与离子通道沿途径迹蚀刻速率的急剧变化有关。通过引入多阶段刻蚀技术和采用较短的刻蚀间隔来改善响应数据。

The solid state nuclear track detector (SSNTD) shows its characteristic feature in personal dosimetry for crews in space shuttles, separate measurement of charged particles emitted from laser-induced plasmas and many other research fields. It is indispensable for such applications to utilize well-defined data of fundamental response of SSNTDs to charged particles. In the present, however, there remains a serious problem of no common database. It is the main purpose of this research to establish a reliable database for light ions through international comparison among Universite de Franche-Conte (UFC), France, Dresden University of Technology (DUT), Germany and Kobe University of Mercantile Marine (KUMM), Japan.At first, all the data for proton (p), deuteron (d), triton (t) and alpha-particle (α), obtained by 1999, were checked and compiled including some new data from additional experiments.The CR-39 samples irradiated by lithium ions (Li) with energies of 4.8, 6.8 and 10.8 MeV were distributed in three teams, and then processed and analyzed independently. All data were consistent with each team. We also found out that the response function depended slightly upon the incident energy. It was considered to be caused by an existence of less sensitive layer near the surface.Finally, the response of CR-39 detector to carbon ions (C) upto 22.5 MeV was evaluated in 2002. The deviation among three teams was enlarged, especially near the endpoint of the ion trajectory. It would be related with a steep change in the track etch rate along the ion pass. We improved the response data by introducing the multi-stage etching technique and taking a shorter etching interval.