Activity refers to how much radiation (in the form of particles or photons) is being emitted by a source, while exposure measures the effects of that radiation on anything that absorbs it. When trying to measure radiation there are two separate aspects to consider: radiation activity, and radiation exposure. Due to its high potassium content, eating a banana will provide you with a dose of 0.1 μSv from the naturally-occurring potassium-40 isotope.Some medical X-rays and similar procedures provide radiation doses, with a typical X-ray or CT scan of your head exposing you to 2,600 μSv of ionising radiation.As granite emits more radiation than other materials, a home would granite tiles would exposure the occupants to an extra 1,000 μSv of background radiation annually.For example, if you flew return from Sydney to Los Angeles, you would receive an extra 160 μSv of background radiation dose. Passengers on high-altitude flights receive more exposure to cosmic radiation than they would experience at ground level.Again, this low level of background radiation is not harmful. As a typical example, in the county of Cornwall, UK, people receive about 7,800 μSv of ionising radiation every year. Australia's level of natural background radiation is quite low compared to many other parts of the world.Low exposure to ionising radiation at this background level is not harmful. This is the level of natural background radiation in Australia. In Australia, people receive about 1,500 to 2,000 μSv of ionising radiation every year.Average exposures to background radiation Many buildings also emit ionising radiation simply because the materials that were used to build them, such as clay bricks and granite, are naturally radioactive. Airline flights and skiing at high altitudes are activities that will increase exposure to this cosmic radiation. The sun is a major source of cosmic radiation, or radiation originating from space. Australian Centre for Neutron Scattering ExpandĪustralians are constantly exposed to ionising radiation from a variety of natural and artificial sources.Neutron Activation Analysis and Neutron irradiation.
Reconstructing Australia’s fire history.
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