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In the section on background radiation, I believe that there is an error in the conversion from R to mSv. The average lifetime dose is stated as 16 R or 160 mSv implying a conversion factor of 10mSv/R. This is close enough to the accepted value of 9.33 mGy/R to satisfy me. However, the range is quoted as 0.17 μR/h to 11 μR/h (1.5 to 100 mSv/a). Taking the first figure; 1.5 mSv/a = 1.5/10 = 150 mR/a = 150/365/24 = 17 μR/h. That is, a factor of 100 different from the stated value. The upper limit is out by a similar factor. The figures in SI units agree with the Wiki article on background radiation (average 2.4 mSv/a) and the Uranium Information Centre (http://www.uic.com.au/ral.htm) figures. I am therefore assuming it is the figures in Röntgen that are in error. I will make the appropriate edit to the main article. I hope no one objects. Spinningspark 17:01, 13 June 2007 (UTC)[reply]

pronounciation

Rent'ken, short e, short e; not sure that that's correct, but it's closer than I mangled it earlier today. htom (talk) 18:22, 26 August 2008 (UTC)[reply]

date of use

When was this unit superseded in favor of the sievert? I have an old gamma ray detector and it's calibrated in R/Hr, so it would be interesting to know. —Preceding unsigned comment added by 75.164.238.106 (talk) 10:20, 29 May 2009 (UTC)[reply]

unit conversion in image

in the image on the bottom right it says that 9.8 microR per hour is about 150 milliR per year. Unless there is some other conversion involved (energy compensation?), 9.8 uR/hr = 235.2 uR/day = 85848 uR/year = 85.8 mR/year. Unless I am incorrect, could someone change this? 24.240.36.218 (talk) 20:28, 23 March 2010 (UTC)[reply]

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 When was this unit superseded in favor of the sievert? I have an old gamma ray detector and it's calibrated in R/Hr, so it would be interesting to know.  <span style="font-size: smaller;" class="autosigned">—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/75.164.238.106|75.164.238.106]] ([[User talk:75.164.238.106|talk]]) 10:20, 29 May 2009 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->
+== unit conversion in image ==
+in the image on the bottom right it says that 9.8 microR per hour is about 150 milliR per year. Unless there is some other conversion involved (energy compensation?), 9.8 uR/hr = 235.2 uR/day = 85848 uR/year = 85.8 mR/year. Unless I am incorrect, could someone change this? [[Special:Contributions/24.240.36.218|24.240.36.218]] ([[User talk:24.240.36.218|talk]]) 20:28, 23 March 2010 (UTC)