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

1.对实际尺寸(25×25 cm~2)的核乳胶板的显影条件进行了优化。获得了-25/100um的有效颗粒密度。然而，平板的黑暗将对识别低能核碎片的电荷和同位素的图像分析造成损害。我们发现Ready-Mede激光扫描显微镜(LSM)在改变焦平面的过程中，并没有给出已知的(phi0.5um)晶体均匀的反射光照。我们改装了一台普通光学显微镜。改进型有两个光源，这意味着我们可以通过反射光和透射光同时观察乳化液。位置分辨率光学方向为0.3um，垂直方向为0.2um。这一结果应该在顺序光学显微镜的每个方向上与1um和0.3um或更多进行比较。我们用改进的显微镜分析了乳剂中^3He^&lt；2+&gt；和^3He^&lt；2+&gt；(13.5 MeV)径迹的图像。^3He^；2+；磁道的宽度比^4He^；2+磁道的宽度窄6-7%。由于自动拾取焦平面的软件还没有完全完成，我们还需要很长的时间，目前还不能系统地讨论。然而，我们已经知道该怎么做了。识别每个轨道的能量损失与音量之间的关系。如果每个径迹的颗粒线性地反映损失的能量，则^3He^&lt；2+&gt；和^4He^&lt；2+&gt；(13.5 MeV)径迹的上述宽度的计算体积应该相同。结果表明，短磁道的体积比长磁道的体积小-20%。我们知道乳化液中的径迹体积不在衡量能量损失的良好指标上。然而，^3He^2+和^4He^2+>径迹的较大体积差将是识别电荷和/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.