Abstract
IN a previous communication1, I pointed out the photographic action of artificial radio-elements; as an application of this, it has been possible to study the β-ray absorption of radiophosphorus through aluminium. Radiophosphorus was prepared by irradiating carbon disulphide by means of the neutrons emitted from 900 mgm. radium plus beryllium; its concentration was effected by means of an electric field2. The solutions containing (20–200 × 103 kicks per minute) were evaporated to dryness on a water-bath in leaden vessels 1.5 cm. × 12 cm. × 0.3 cm. In order to establish the absorption curve, a series of aluminium absorption screens of increasing thickness (0.1-1.06 mm. and every 0.1 mm. up to 1 mm.) were placed between a Kodak X-ray film and each of these vessels. The photographs obtained were checked by means of a Zeiss microphotometer.
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References
Groven, Ch., Govaerts, J., and Gueben, G., NATURE, 141, 916 (1938).
Govaerts, J., Bull. Soc. Roy. Sci. Liége, 121 (1939).
Bothe, W., Z. Phys., 8, 243 (1922).
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GOVAERTS, J. A Photographic Method of Studying β-Ray Absorption by 3215P. Nature 145, 624 (1940). https://doi.org/10.1038/145624b0
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DOI: https://doi.org/10.1038/145624b0
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