Code of practice for the protection of persons exposed to ionizing radiations / [prepared by the Standing Advisory Committee].

  • Great Britain. Radioactive Substances Advisory Committee.
Date:
1957
Catalogue details

Licence: Public Domain Mark

Credit: Code of practice for the protection of persons exposed to ionizing radiations / [prepared by the Standing Advisory Committee]. Source: Wellcome Collection.

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    X-ray target: structure subjected to bombardment by accelerated electrons in an X-ray tube or accelerator and from which the main beam of X-rays is emitted. X-ray tube housing: an enclosure which covers the tube and sometimes also other portions of the X-ray equipment (transformer) and which limits the major portion of radiation emitted from the tube to the useful beam. (a) Diagnostic-type protective tube housing: a tube housing in which the direct radiation is reduced to, at most, 100 mr/h or 28 ur/sec at a distance of one metre from the tube target when the tube is continuously operated with closed window at its maximum rated current for the maximum rated voltage. (b) Fully-protective tube housing: tube housing in which the leakage radiation is reduced to, at most, 6:25 mr/h corresponding to 300 mr/week for 48 hours’ exposure time, in contact with the tube housing when the tube is continuously operated with closed window at its maximum rated current for the maximum rated voltage. (c) Highly-protective tube housing: tube housing in which the leakage radiation is reduced to, at most, 100 mr/h corresponding 300 mr/week for 3 hours’ exposure time, in contact with the tube housing when the tube is continuously operated with closed window at its maximum rated current for the maximum rated voltage.