why are there so many units of measurement for radiation? Rads, roentgens, greys, severet, and so on?
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Imagine radiation is actually distance.
We have metric and imperial measurements, so two different systems. We then need to also have units for speed, area, volume, pressure etc., so we then end up with meters per second, miles per hour, square meters, hectares, cubic meters, cubic inches etc. Now to convert this back to radiation, we also have trickier ways to measure radiation than a simple linear measurement, which produces many different units from one system, let alone two or more.
As to standardisation across the world, this is as difficult as the why and how one could get America to convert to the metric system, or visa versa for Europe. Granted less people use radiation measurements on a daily basis, however there will always be people who refuses to change, and will want to use the system they did at university.
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