MTC Photography Posted March 25, 2000 Share Posted March 25, 2000 <p><HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Author" CONTENT="Ying Tai"> <META NAME="GENERATOR" CONTENT="Mozilla/4.04 [en]C-NECCK (Win95; U) [Netscape]"> <TITLE>xray</TITLE></HEAD><BODY><FONT COLOR="#3333FF"><FONT SIZE=+2>X-Ray Absorption of Minox 8x11Camera</FONT></FONT> <P><FONT COLOR="#000000"> Today's airports armed with X ray machine to detect hidden weapon. But X-ray may fog the film inside the camera.</FONT><p> Different material has differentopacity to X-ray. The purpose of this article is to comparethe absorption property of various Minox 8x11 cameras and compare the relative safety of film inside <P><FONT COLOR="#000000"> The absorption property of metal is expressed by</FONT><BR> <P><FONT COLOR="#000000"> <FONT SIZE=+2>I=I</FONT><FONT SIZE=-2>0</FONT><FONT SIZE=+2> *exp(-Mu*d)</FONT></FONT><BR> <P><FONT COLOR="#000000"> In which I is the intensity of the X-ray after passing a sheet of metal of thicknessd, I0 is the initial intensity</FONT><DL><DD><FONT COLOR="#000000">of the X-ray, and <FONT FACE="Math C"></FONT>Mu is the X-ray absorption factor. The higher the absorption factor, the less residue</FONT></DD> <DD><FONT COLOR="#000000">X-ray passing to the film.</FONT></DD></DL> <BR> <CENTER><TABLE BORDER=3 CELLSPACING=3 CELLPADDING=3 COLS=4 WIDTH="60%" BGCOLOR="#3333FF" ><CAPTION><FONT COLOR="#FF0000"><FONT SIZE=+2>Residue X-ray inside Minox 8x11 camera, d=0.1 cm</FONT></FONT></CAPTION> <TR><TD><CENTER> <FONT COLOR="#FFFFFF">Minox </FONT></CENTER></TD> <TD><FONT COLOR="#FFFFFF"> metal</FONT></TD> <TD><FONT COLOR="#FFFFFF"> Mu</FONT></TD> <TD><FONT COLOR="#FFFFFF"> Residue X-ray</FONT></TD></TR> <TR><TD><FONT COLOR="#FFFFFF">LX</FONT></TD> <TD><FONT COLOR="#FFFFFF"> aluminum</FONT></TD> <TD><FONT COLOR="#FFFFFF">0.624</FONT></TD> <TD><FONT COLOR="#FFFFFF"> 94%</FONT></TD></TR> <TR><TD><FONT COLOR="#FFFFFF">Riga</FONT></TD> <TD><FONT COLOR="#FFFFFF"> steel</FONT></TD> <TD><FONT COLOR="#FFFFFF">8.5</FONT></TD> <TD><FONT COLOR="#FFFFFF">43%</FONT></TD></TR> <TR><TD><FONT COLOR="#FFFFFF">LX gold</FONT></TD> <TD><FONT COLOR="#FFFFFF">brass</FONT></TD> <TD><FONT COLOR="#FFFFFF">13.6</FONT></TD> <TD><FONT COLOR="#FFFFFF">26%</FONT></TD></TR> <TR><TD><FONT COLOR="#FFFFFF">LX Sterling silver</FONT></TD> <TD><FONT COLOR="#FFFFFF">silver</FONT></TD> <TD><FONT COLOR="#FFFFFF">60.45</FONT></TD> <TD><FONT COLOR="#FFFFFF">0.24%</FONT></TD></TR></TABLE></CENTER> <BR> <UL><LI> Aluminum body Minoxes, such as chrome or black A/B/C/BL/LX/TLX/CLX has practically no protection for X-Ray.</LI> <LI> Riga Minox absorbs less then half of the X-ray</LI> <LI>Gold Minox with brass inner shell absorbs about three quarters of X-ray</LI> <LI>The best protection for X-ray is the Sterling Silver Minox camera, which absorbs 99.7% of the X-ray</LI> <LI>A lead Minox of similar thickness has residue X ray of 0.54%. Silver has better X-ray protection then lead.</LI></UL><p><P> <FONT COLOR="#006600"><FONT SIZE=+2>SILVER OR LEAD STORAGE BOX</FONT></FONT><BR> <BR> Minoxerwho owns a Sterling silver Minox can walk though X-Ray machine without fear of fogging. <P> The nextbest thing to do is find a small silver box or lead box to store aluminum Minox camera. A silver or lead box of only 1 mm thick will practicallyabsorb 99.7 % or 99.4% of X-ray. Silver box islighter and looks more elegant.</BODY></HTML> Link to comment Share on other sites More sharing options...
ken_trettin Posted March 25, 2000 Share Posted March 25, 2000 Lead lined film bags or small cans/boxes are readily available from many photo dealers. Although they are intended to hold 35mm film, they are big enough for an 8 x 11 Minox and quite a bit of film. When traveling I normally carry my film in a clear zip lock plastic bag which I remove from the pocket in my carryon luggage and have it visually inspected. I carry my cameras in my pocket (a IIIs and a B). Undo the safety chain from your belt loops before aproaching the check point. I find about half of the itme I can walk through with the cameras in my pocket--I have more trouble with belt buckles or forgetting to take my keys out of my pocket. If the security person wants to check the camera and look trough the viewfinder, do as I do, take a picture of them rather than close it up and completely waste an exposure. Link to comment Share on other sites More sharing options...
MTC Photography Posted July 27, 2001 Author Share Posted July 27, 2001 <h3>Silver is more effective than Lead in X ray absorbtion </h3> <p> the Mu index of silver is 60.4, the Mu factor of lead is 52.2 <p> One residue X ray after passing through: <ul> <li> 1 mm lead is 0.0054 <li> 1 mm silver is 0.0024 </ul> 1 mm of silver absorbs 99.8 % of Xray Link to comment Share on other sites More sharing options...
avatar Posted July 14, 2002 Share Posted July 14, 2002 Soft X-ray bombardment of Aluminum and some other metals may cause secondary beta particle emissions. This is probably not a concern for 35mm users whose metal film cannisters would stop the beta particles. Under the Code of Federal Regulations, film doesn't have to be x-rayed in US airports (except maybe film backs)! It does not matter what speed it is. It can all be hand checked if you like. Here is how to avoid the X-ray machine Check my page on it! Here is your definate answer to x-raying in airports. There are links to all the relevant regulations for printing along with an explanation of the federal structure and tips to make things go easier: <a href="http://home.kc.rr.com/aaronphoto/xray.html">http://home.kc.rr.com/aaronphoto/xray.html</a> Link to comment Share on other sites More sharing options...
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