Abstract
THE pinhole camera method of taking gamma-radioautographs, though it has been described in the literature1, has had very little use because of the long exposure times which are necessary even when the most sensitive radiographic films are used. An intensifying screen for use with the pinhole camera has now been developed which has made it possible to reduce the exposure time considerably. The screen consists of a large, flat crystal of thallium-activated sodium iodide. The gamma-rays produce scintillations in the crystal which in turn affect the photographic plate. This method has made it possible to take an in vivo gamma-ray pinhole radioautograph of a tumour containing 20 millicuries of iodine-131.
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References
Copeland, D. Eugene, and Benjamin, Emanuel W., Nucleonics, 5, No. 2, 44 (1949).
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ANGER, H. Use of a Gamma-Ray Pinhole Camera for in vivo Studies. Nature 170, 200–201 (1952). https://doi.org/10.1038/170200b0
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DOI: https://doi.org/10.1038/170200b0
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