millisievert
2
7.6
- noun
- /ˌmɪlɪˈsiːvərt/
- Specialized
- They have measured 400 milliSieverts/hr at the reactor.
- 400 millisieverts
- 20 millisieverts
- 250 millisieverts
Examples
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Dose rates of up to 400 millisieverts per hour have been reported at the site.
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The radiation level in the area was measured at 15 millisieverts, which is relatively low.
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A millisievert (mSv) is a standard measure of radiation dose.
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Asahi reports that the maximum radiation exposure for workers has been raised from 100 milliSieverts to 250.
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They say that 250 milliSieverts shouldn't cause any acute radiation poisoning symptoms, but it would cause a slight long-term increase.
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Readings reported on Tuesday showed a spike of radioactivity around the plant that made the leakage categorically worse than it had been, with radiation levels measured at one point as high as 400 millisieverts an hour.
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At about 12:30 hrs, March 15, 2011, the fire which broke out in unit-4 is reported to be extinguished, and the radiation fields up to 400 millisieverts/hour have been reported at the Fukushima site.
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This is for greater efficiency—we don't have a lot of data on what the highest radiation levels at the plant are right now, but when they were up to 400 milliSieverts/hr (that was in a very localized area), 15 minutes and you would be done for the year.
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The doctor explained that exposure to more than 10 millisieverts per year increases the risk of health issues.
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According to regulations, the maximum allowable annual dose of millisieverts for the general public is one.
Surface Forms
Morphology
millisievert = sievert (transparent) = milli + sievert
Standard SI prefix 'milli-' denotes one-thousandth of the base unit 'sievert', so the meaning is directly predictable.
Etymology
Millisievert combines milli-, which means 'one thousandth', and sievert, the unit named after the Swedish scientist Rolf Sievert; a helpful way to remember it is like millimeter for meters. So, a millisievert is one thousandth of a sievert and is used to measure the dose of radiation a person receives.