Fluke Biomedical 07-706 - Manual (Page 8)

Nuclear Associates 07-706
Operators Manual
1-4
B. Source Over the Table
1. To obtain the entrance exposure for fluoroscopes that use overhead x-ray tubes, raise the
phantom 30 cm above the tabletop, using the long legs (Figure 1-1). Place the “Rad-Check Plus”
on the phantom to obtain the exposure rate at the position where the beam enters the patient.
2. Follow the same procedure as in steps 3, 4, and 5 of Section A.
Consists of 4 metal plates.
(a) Two 7” x 7” x ¾” blocks of high-purity aluminum, which represent the equivalent absorption of
26 cms of water and simulate a thick or heavy-set patient at 90 kVp. A single block is the
equivalent of a child or adult chest. Aluminum simulates the scatter characteristics of the
human body.
(b) One 7” x 7” x 1/8” lead beam-stop plate. When placed in the beam, this plate allows
automatic brightness-control machines to deliver maximum output.
A 7” x 7” x 1/32” thick aluminum penetrometer plate with ¼”, 0.176”, 1/8”, 0.088” and 1/16” holes are
provided. The area of each hole is twice the area of the next smaller one. Place this plate between the
two aluminum blocks to ascertain the contrast gradient of the penetrometer on the image-amplified
systems.
Size 7” x 7” x 1 7/8” high (17.8 cm x 4.7 cm)
Net 9 ½ lbs (4.3 kg)