There has been much discussion regarding this. Please see this interesting section from Revision ISO 15382 : 2002, Current title : Nuclear energy -- Radiationprotection -- Procedure for radiation protection monitoring in nuclear installations for external exposure to weakly penetrating radiation, especially to beta radiation . This is currently being revised (I am a member on IEC TC45 WG B14.
"The positioning of the eye lens dosemeter is important to have a good estimate of the eye lens dose. The eye lens dosemeter should be worn as close as possible to the eye (on the temple), and in contact with the skin. In case of usage in internventional radiology, the side closest to the X- ray tube should be chosen. When using protective lead glasses or face masks, the dosemeter should be worn preferably below them. This is often not very practical, and a dosemeter above or next to the lead glasses can be chosen. It must be realized that in such cases the eye lens doses can be overestimated with a factor up to 10 (ref). When the dose limits are approached in such cases, this correction factor should be taken into account. In practical situations, dosemeters are often placed in various positions: above the eyes, at the forehead, at the side of the head, between the eyes (Lie et al. 2008, Hausler et al. 2009, Domienik et al., 2011). According to Geber et al., (Geber et al., 2011) a dosemeter placed at the forehead could underestimate the lens dose with up to 45 %. Also, some studies suggest estimating the eye lens dose from the dosemeters placed at collar level(Covens et al. 2007, Clerinx et al. 2008) or from the reading of the whole body dosemeter (Lie et al., 2008). In all those cases, an appropriate correction factor might be needed." Regards, Sandy ----------------------------------- Sander C. Perle President Mirion Technologies Dosimetry Services Division 2652 McGaw Avenue Irvine, CA 92614 +1 (949) 296-2306 (Office) +1 (949) 296-1130 (Fax) Mirion Technologies: http://www.mirion.com/ From: "Langille, Elizabeth Ann" <[email protected]<mailto:[email protected]>> Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Date: Thu, 1 Mar 2012 09:22:06 -0600 To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: Powernet: TVA is interested in knowing what dosimeter is used for LDE When an individual is issued multi-badges, which dosimeter is used for LDE? Head dosimeter exclusively? Or the higher of the head or the chest? TVA currently uses the head dosimeter, but I think there is good reason for using the higher of the two, and would like to know what other programs use. Thank you for your response. Betsy Langille, CHP Program Manager, SFAM Technical Programs TVA Mail Stop WRBA-C 1101 Market Street Chattanooga, TN Office: 423-751-8659 Mobile: 423-486-5672 [email protected]<mailto:[email protected]>
