| GENERAL CHARACTERISTICS ITEM DESCRIPTION | PLASTIC; W/STEEL APERATURE PLATE CONTAINING A 3.0 MM ID CENTRAL HOLE,AND A SET OF META SPACERS 10 CM AND 15 CM LONG RESPECTIVELY; PHANTOM CONTAINS A HELIX OF 12 LEAD NUMBERS MTD 1 TO 12 MM ABOVE BASE,AND FOUR COPPER MESH STRIPS W/0.8,1.2,1.6,2.0 HOLES PER MM IMBEDED IN A PLASTIC PLATE; FOR USE IN DETERMINION OF EXPOSURE UNIFORMITY,CUT LEVEL ACCURACY,AND FULCRUM STABILITY OF TOMOGRAPHIC X-RAY UNITS |