Time, distance and shielding

Radiation protection rules of thumb, frequently asked questions, hints and tips related to time, distance and shielding considerations.

  • Skyshine – radiation scattering around and over shielding

    Published: Sep 29, 2021

      Tags:
    • Skyshine
    • Radiation Shielding
    • Open top radiography
    • Radiation scatter
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  • Protection by reducing exposure time - is it always valid?

    Published: Sep 29, 2021

      Tags:
    • Ionising Radiation
    • Protection by time
    • Very high dose rates
    • High activity Co
    • HASS source
    • Pure alpha emitter
    • Po-210
    • Polonium-210
    • Cabinet x-ray systems
    • < 1 μSv/h
    • < 1 micro Sv/h

    Protection by reducing exposure time to ionising radiation is a recognised practice. However, are there occasions where this is not so valid (or not valid at all )? This guidance provides some examples to illustrate this. 

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  • Inverse Square Law - when is a source a point source?

    Published: Sep 29, 2021

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In radiation protection I spend most of my time explaining to clients what they do not need to worry about.

– Mark Ramsay -