R&D OF BRIGHT-AND DARK-FIELD LASER MICROSCOPE TO RECOGNIZE THE CHARGES AND/OR THE ISOTOPES OF CHARGED PARTICLES.

1. 我们尝试对实际尺寸（25*25cm^2）的核乳液板的显影条件进行优化。获得了-25/100mum的有效晶粒密度。然而，底片的黑暗会给图像分析识别低能核碎片的电荷和同位素带来损害。我们发现，现成的激光扫描显微镜（LSM）对已知的（ph0.5 mum）晶体在改变焦平面时不能给出均匀的反射照明。我们改良了一台普通光学显微镜。改进后的一种有两个光源，这意味着我们可以同时通过反射光和穿透光来观察乳剂。光学方向的位置分辨率为0.3mum，垂直方向的位置分辨率为0.2mum。该结果应与普通光学显微镜各方向1mum和0.3mum或更大的结果进行比较。我们用改进的显微镜分析了乳剂中^3He^<2+>和^3He^<2+>(13.5MeV)径迹图像。^3He^<2+>磁道宽度比^4He^<2+>磁道宽度窄6-7%。由于自动提取焦平面的软件还没有完全制作出来，我们需要很多时间，现在还不能系统地讨论。然而，我们已经知道我们该怎么做。认识到损失的能量和每条音轨的音量之间的关系。如果每条磁道的颗粒线性反映损失的能量，则上述^3He^<2+>和^4He^<2+>(13.5MeV)磁道宽度计算出的体积应该是相同的。结果是，短的^4He^<2+>磁道的体积比长^3He^<2+>磁道的体积小-20%。我们已经认识到乳化液中径迹体积并不是衡量损失能量的一个很好的指标。然而，^3He^<2+>和^4He^<2+>轨道之间较大的体积差异将是识别电荷和/或同位素的一个很好的指标。

1. We have tried to optimize the development condition for the actual size(25*25cm^2) of nuclear emulsion plate. An efficient grain density of -25/100mum was obtained. The darkness of plates, however, shall give a damage for image analysis to recognize the charges and isotopes of low-energy nuclear fragments.2. We found that ready-mede laser Scanning Microscope (LSM) did not give uniform reflected illunination for known (phi0.5mum) crystals in changing the focal plane.3. We modified an ordinal light microscope. Modified one has two light sources and this means that we can observe emulsion by reflected and penetrated lights at once. Position resolutions become 0.3mum for optical direction and 0.2mum for its vertical direction, respectively. This results shuld be compared with 1mum and 0.3mum or more in each directions of ordinal light microscope.4. We have analyzed images of ^3He^<2+> and ^3He^<2+>(13.5MeV) tracks in emulsion taken by a modified microscope. The width of a ^3He^<2+> track is 6-7% narrower than that of a ^4He^<2+> track. Since softwares to automatically pick up the focal plane is not fully made, yet, we need much time and con't discuss systemaically, now. However, we have known how we have to do.5. To recognize the relation between the lost energy and the volume of each tracks. If the grains of each traks reflect the lost energy, linearly, the caliculated volumes by the above width of ^3He^<2+> and ^4He^<2+>(13.5MeV) tracks should be same. The result was that the volume of a short ^4He^<2+> track was -20% smaller than that of a long ^3He^<2+> track. We have understood track volume in emulsion was not on good index to measure lost energy. However, the bigger difference of volumes between a ^3He^<2+> and ^4He^<2+> track would be an good index to recognize the charges and/or isotopes.