| CGRO COMPTEL (1941 words) |
 | In some ways, COMPTEL is similar to an optical camera: the upper detector, analogous to a camera's lens, directs the light onto the second detector, comparable to the film, in which the scattered photon is absorbed. |
| In this mode an incident cosmic gamma ray is electronically identified by a delayed coincidence satisfying time-of-flight criteria between the upper and the lower detectors, combined with the absence of a signal from all charged particle shields and from the calibration detectors. |
| COMPTEL can then automatically be commanded to enter an alternate event selection mode to measure solar neutrons for a period of 90 minutes (or approximately one orbit of the spacecraft). |
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