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

固体核径迹探测器（SSNTD）在航天飞机乘员个人剂量测量、激光等离子体发射带电粒子的分离测量等许多研究领域显示出其独特的功能。利用SSNTD对带电粒子的基本响应的定义明确的数据对于这样的应用是必不可少的。然而，目前仍然存在没有共同数据库的严重问题。本研究的主要目的是通过法国UFC、德国Dresden University of Technology和日本科比University of Mercantile Marine的国际比对，建立一个可靠的轻离子数据库。对CR-39样品分别进行了能量为4.8，6.8，10.8MeV的锂离子辐照处理，并分别进行了处理和分析。所有数据与每个团队一致。我们还发现，响应函数略有依赖于入射能量。最后，在2002年对CR-39探测器对22.5MeV以下碳离子（C）的响应进行了评估。三个团队之间的偏差有所扩大，特别是在离子轨迹的终点附近。这将与轨道蚀刻速率沿离子通道沿着的急剧变化有关。通过引入多级腐蚀技术和缩短腐蚀间隔，提高了响应数据。

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.