Editing Sievert (section)

===ICRP dose limits===

The ICRP recommends a number of limits for dose uptake in table 8 of report 103. These limits are "situational", for planned, emergency and existing situations. Within these situations, limits are given for the following groups:<ref>{{cite journal|last1=ICRP|title=Report 103|pages=Table 8, section 6.5}}</ref>

* Planned exposure – limits given for occupational, medical and public 
* Emergency exposure – limits given for occupational and public exposure 
* Existing exposure – All persons exposed

For occupational exposure, the limit is 50&nbsp;mSv in a single year with a maximum of 100&nbsp;mSv in a consecutive five-year period, and for the public to an average of 1&nbsp;mSv (0.001&nbsp;Sv) of effective dose per year, not including medical and occupational exposures.<ref name="ICRP103" />

For comparison, natural radiation levels inside the [[United States Capitol]] are such that a human body would receive an additional dose rate of 0.85&nbsp;mSv/a, close to the regulatory limit, because of the uranium content of the [[granite]] structure.<ref name="FUSRAP">{{cite web |last=Formerly Utilized Sites Remedial Action Program |title=Radiation in the Environment |url=http://www.lrb.usace.army.mil/fusrap/docs/fusrap-fs-radenvironment-2008-09.pdf |publisher=US Army Corps of Engineers |access-date=18 May 2012 |archive-url=https://web.archive.org/web/20120211162419/http://www.lrb.usace.army.mil/fusrap/docs/fusrap-fs-radenvironment-2008-09.pdf |archive-date=11 February 2012 |url-status=dead}}</ref> According to the conservative ICRP model, someone who spent 20 years inside the capitol building would have an extra one in a thousand chance of getting cancer, over and above any other existing risk (calculated as: 20&nbsp;a·0.85&nbsp;mSv/a·0.001&nbsp;Sv/mSv·5.5%/Sv ≈ 0.1%). However, that "existing risk" is much higher; an average American would have a 10% chance of getting cancer during this same 20-year period, even without any exposure to artificial radiation (see natural [[Epidemiology of cancer]] and [[cancer rates]]).