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Readings indicate radiation levels from all sources including background, and real-time readings are in general unvalidated, but correlation between independent detectors increases confidence in measured levels. List of near-real-time government radiation measurement sites, employing multiple instrument types:
Recognized effects of higher acute radiation doses are described in more detail in the article on radiation poisoning.Although the International System of Units (SI) defines the sievert (Sv) as the unit of radiation dose equivalent, chronic radiation levels and standards are still often given in units of millirems (mrem), where 1 mrem equals 1/1,000 of a rem and 1 rem equals 0.01 Sv.
"The survey results indicate that most of the site is consistent with normal background radiation levels, but 10 locations showed elevated readings," a CDPH spokesperson said. "Our initial ...
Counts is the number of events detected, but dose rate relates to the amount of ionising energy deposited in the sensor of the radiation detector. The conversion calculation is dependent on the radiation energy levels, the type of radiation being detected and the radiometric characteristic of the detector. [1]
Radiation levels in Tokyo on 15 March were at one point measured at 0.809 μSv/hour although they were later reported to be at "about twice the normal level". [203] [204] Later, on 15 March 2011, Edano reported that radiation levels were lower and the average radiation dose rate over the whole day was 0.109 μSv/h. [203]
Hazardous levels of ionizing radiation are signified by the trefoil sign on a yellow background. These are usually posted at the boundary of a radiation controlled area or in any place where radiation levels are significantly above background due to human intervention.
World anthropogenic background radiation levels peaked at 0.11 mSv/yr above natural level of 2.40 mSv/yr in 1963, the year that the Partial Nuclear Test Ban Treaty was enacted. This was a 4.6% increase above normal background radiation exposure. Since then, by about 2008, anthropogenic background radiation has decreased to 0.005 mSv/yr above ...
Radiation readings ‘off-scale high’ The updated NRC information says that as the two pipefitters left the heat exchanger room, they were frisked by radiation protection staff “and the ...
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