The sievert (symbol Sv) is an SI derived unit of radiation dose. It is defined as the dose received in one hour at a distance of 1 cm from a point source of 1 mg of radium in a 0.5 mm thick platinum enclosure. It is approximately equivalent to 8.4 röntgens or 21.6 curie/kilogram.
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... there are 19,701 people, 6,700 households, and 5,011 families residing in the town. The population density is 1,549.2/km² (4,010.1/mi²). There are 6,949 housing ...