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PubMed1995

Radiation protection requirements for medical x-ray film.

Previous darkroom shielding requirements for medical x-ray film-assumed that the film should not be exposed to diagnostic x-ray radiation levels greater than 2 microGy (0.2 mR) for the life of the film. Modern medical x-ray films are much less sensitive to ionizing radiation, with most films showing at least an order of magnitude less sensitivity than previously assumed. Conversely, these same films when loaded in cassettes using modern intensifying screens exhibit an order of magnitude greater sensitivity when these cassettes are exposed to ionizing radiation. These data suggest that protection of modern medical x-ray film, stored in a darkroom, may require less shielding than previously assumed. Conversely, film loaded in a cassette will require greater shielding.

Radiation Protection↗
PubMed1988

Evolving perspectives on the concept of dose in radiobiology and radiation protection.

Since the discovery of the x ray more than 90 y ago, the biological effects of radiation have been a subject of intensive and continuing study. At the outset, such study was severely hampered by the lack of a suitable method of dosimetry. More than a quarter of a century elapsed before the introduction of a quantitative system for measuring exposure, and another quarter of a century elapsed before the introduction of quantitative units of absorbed dose. In the meantime, the effects of a given dose had long since been found to depend on its distribution in space and time; that is, on the precise spatial and temporal patterns of energy deposition within absorbing tissues and cells. Study of the biological effects of radiation thus led to elaboration of the concept of dose, to take into account relevant microdosimetric parameters. Advances in ongoing research on the molecular mechanisms of radiation effects can be expected to result in further evolution of such coNcepts.

Animals↗