| 摘要 |
<p>An improved light guide for use in a radiation detecting apparatus. The areas of the surfaces of the light guide not in contact with the photomultiplier tubes or the scintillating crystal assembly are covered with a highly light absorbent coating, such as black paint. In the preferred form, V-shapped indentations extend into the surface of the light guide and encircle the light sensitive faces of the photomultiplier tubes about the periphery thereof. These V-shaped indentations are also coated with a light absorbent coating. This improvement in the construction of the light guide reduces greatly the occurrence of "hot spots", which are recordations in a two-dimensional co-ordinate system of inordinately large concentrations of light that are not actually present at certain spots in the radiation source.</p> |
