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Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Hello all, I need to use some 1/4" lead sheet as shielding for my x-ray experiments. I am wondering how hard it is to bend sheeting this thick? I could use multiple sheets of thinner material, but could save money by buying one sheet of 1/4" lead shielding. My plan was to roll the lead over some pvc pipe and stick the x-ray tube into this.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
If it's soft (reasonably pure) lead, you could roll up the 1/4" sheet using a steel pipe mandrel, a large vise, and a big rubber mallet. It would look ugly at the seam, assuming you overlap the ends instead of leaving an unshielded slot.
Would the thick lead save you money, if 1 layer of thinner lead is all you need? If you are not going above 60 kV, the attenuation factor (according to Rad Pro Calculator) is about a million for 1/4" lead, and 1000 for 1/8" lead or 3/8 inch steel (e.g. many turns of galvanized roof flashing)
Especially if you intend to make exposures on film instead of just the highly intensified fluoroscope, people here will point out that you should shield more than just the barrel of the tube. Because some radiation from the ends, and from the beam path, will be scattered toward you (even by air).
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Hello, That sounds like a lot of work. I think I will go with one long thin strip and just make layers. I plan to go up to 70kV (eventually) so I am planning ahead. Thanks! Matt
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
I was actual just going to suggest layers as I was reading this and in fact there are some excellent designs in various studies of "suits of armor". The smiths of the 15th century and there about were quite proud of making armor comfortable and useful for the Knights of that period. The ability to provide range of motion but yet employ simplicity is an art. There is a common book that many of those who study Medieval history entitled "Brassy's Body Armor, Robert Wooosnam--Savage & Anthony Hall which details the various techniques employed by those who had little more than a anvil and a hammer. The designs are marvels of simplicity & may provide the exact examples, that if used with a softer materiel, would be perfect.
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
According to RadPro, iron pipe wont do too much. Its got to be lead. I found that McMaster-Carr sells lead sheeting. I can get a 36"X4" strip of 3/32" lead for $25.00. I will get two of these strips. One for the x-ray tube body, and another to make a chamber that the object goes into. (One side will have the fluoroscope and the other the output window of the x-ray tube. Sound good? Matt
Registered Member #2261
Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
Lead is particularly easy to melt and the low(ish) temperature makes lots of things suitable for building the mold, but allow for shrinkage as the lead cools.
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Working with Lead Sheet
