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The modern international system of units includes the Gray, the Sievert, and the Becquerel (Bq); these replace the rad, rem , and Curie, respectively.
The rem takes account of a ‘quality factor’, which for the more dangerous alpha particles is 10.
An area in which radiation levels could result in an individual receiving a dose equivalent in excess of 0.1 rem per hour.
According to Badhwar, the total increase in cosmonaut exposure was about 6 or 7 rem , a dose equivalent to 100 to 150 days of additional radiation exposure.
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