Gamma camera activated to be responsive to selected levels of light emission
The invention concerns apparatus for use in investigating the distribution of radiation from an extended source of ionizing rays and is particularly concerned with gamma cameras for sensing gamma radiation. In normal gamma cameras, due to the long exposure time, the sensitivity of the camera is reduced by spurious light emission from the scintillation screen. In the present invention the effect of this spurious emission is reduced by only triggering the image intensifier in response to predetermined values of light emission. This predetermined triggering is achieved by collecting the unwanted light emitted at the edges of the scintillation screen and directing this into one or more photomultipliers, the outputs of which are taken to a pulse height analyzer which is used to trigger the image intensifier. (Official Gazette)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-29-029472
- OSTI ID:
- 4333781
- Report Number(s):
- US 3793519
- Country of Publication:
- United Kingdom
- Language:
- English
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