| 摘要 |
PURPOSE:To obtain a detection element with high energy resolution even in case of high energy in incident radioactive rays, by making a thickness of a crystal between electrodes be smaller than a distance at which carriers can be moved and making the radioactive rays become incident parallel in the direction of the electrodes. CONSTITUTION:A CdTe crystal 1 of a radioactive-ray detection element E is made to be 0.1mm in its thickness (d), 5mm in its width W, and 10mm in its length L. The thickness (d) is made smaller than a distance lambda h at which holes of CdTe can be moved, and the length L is made larger than an invasion depth of the radioactive rays. Electrodes 2 are formed by vacuum evaporation and plating processes of electrode metals such as Al, Au, Pt, and In. Though a direction of the length L is illustrated as an incident direction of the radioactive rays, the direction of the width W is allowable for it. In the radioactive- ray detection element in which the electrodes are formed on facing surfaces of a crystal substrate, when the thickness of the crystal between the electrodes is made smaller than a distance at which the carriers can be moved and further when the radioactive rays are made to become incident parallel in the direction of the electrodes in this way, high energy resolution can be obtained.
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