| 摘要 |
<p>An image intensifier type of gamma ray scintillation camera employing a relatively thick scintillation crystal at the input end for good efficiency in converting gamma rays into scintillations and a fast, position sensitive photodiode with computer circuitry at the output end for producing coordinate electrical signals representing the centroid of the relatively large light spot striking the photodiode. Pulse height analysis is performed on the total sum signal from the photodiode to reject unwanted events manifested at the output of the photodiode, and appropriate ratio computing circuitry is employed to maintain a constant image size over a range of intensities of light spots striking the photodiode.</p> |
