Fourth layer of bricks (yellow) is laid out so that there is an 8" wide opening for sample holder and a 16" by 16" opening which forms the interior of the castle.  Requires two 6" long and four 4" long bricks in addition to 19 standard-sized bricks.  The sample holder is made from a 5/16" sheet of aluminum and slides in and out to allow positioning of a sample container (diameter = 6 inches) directly beneath the detector. Click here to see Figure 4.  A dolly on wheels carrying lead bricks rolls against castle to seal opening.  Click here to see Figure 3.   

NOTE:  A 3/8" thick aluminum plate is placed on top of the fourth layer. The plate is 32" by 32" in size and has a 16" by 16" square cut out of its center. 

For more information about this report contact: Stephen L. Snyder or Joseph S. Duval
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