| 摘要 |
<p>PURPOSE: To evaluate the integrated maximum amplitude of a flash generated by gamma radiation during a prefixed period of time so as to eliminate the obstacle of a position signal by detecting and weighting the flash and integrating the maximum amplitude of the flask for discriminating whether or not the maximum amplitude falls within a preset range. CONSTITUTION: A flash (s) generated in a crystal 1 by gamma radiation (p) is detected and amplified by means of a group of photomultiplier tubes 5 and constitutes an electric contribution. The electric contribution is continuously weighted by means of resistance arrays 7 and 16 and, when the maximum amplitude of the flash (s) falls within a preset range, the amplitude is transmitted by means of a transmission circuit 9 and integrated by means of integrators 10 and 27. A processing circuit 20 processes the results of the integration and generates positioning pulses X and Y. Then the energy of the flash (s) is measured and, when the flash (s) belongs to a preset energy band, the positioning signals X and Y are evaluated as effective.</p> |
