Fluke Biomedical 76-801 - Manual (Page 6)

Nuclear Associates 76-801,76-801-1926,76-804,76-807
Operators Manual
1-2
1.2 Specifications
Rectangular Flood Phantom (76-801)
Dimensions 18” x 23” x 1” thick
Cavity Dimensions 16” x 21” x ½” deep
Weight 10 lbs
Extra-Large Rectangular Flood Phantom (76-801-1926)
Dimensions 20½” x 28” x 1¼” thick
Cavity Dimensions 18½” x 26” x ½” deep
Weight 20 lbs
Jumbo Flood Phantom (76-804)
Dimensions 18” x 18” x 1” thick
Cavity Dimensions 17” x 17” x ½” deep
Weight 9 lbs
Gigantic Flood Phantom (76-807)
Dimensions 23” x 23” x 1” thick
Cavity Dimensions 22” x 22” x ½” deep
Weight 13 lbs
1.3 Filling the Phantom
The filler and vent plugs of these phantoms are located on the flat surface rather than on one of the
edges. Filling the phantom through openings on the edge requires that the phantom stand up on the
opposite edge. This causes water pressure to develop on the flat faces, making them bulge. These
bulges remain, even when the phantom is placed horizontally, causing non-uniformities in the distribution
of radioactivity. By filling the phantom in the flat or horizontal position (with the filling vent corner raised a
fraction of an inch, so as not to trap air), water pressure build-up due to depth is prevented, resulting in a
totally non-bulging phantom.
1. Remove the filler and vent plugs and the rubber “O” rings.
2. Partially fill the phantom with water to approximately 90% of capacity.
3. Spike the solution in the phantom with an appropriate isotope (5-10 mCi of Tc-99 m is more than
sufficient activity).
4. Replace the vent and filler plugs, and rubber “O” rings carefully so that the phantom is properly sealed.
(Do not over-tighten.)
5. Grasp the flood phantom by the edges and rotate it so that the trapped air serves to mix the spike and
carrier solution. Thirty seconds is sufficient to insure homogeneity of the mixture.
6. Remove the filler and vent plugs and carefully fill the flood phantom completely with degassed water.
Remove any trapped air by lightly tapping the face of the phantom.
7. Replace the filler and vent plugs in a controlled area and make sure that no leaks are present.