LORAD AFFINITY Series - X-Ray Tubehead Leakage Check

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4-42 P/N 9-500-0255

Service Manual

Chapter 4: Calibrations and Performance Checks

Performance Checks

2. Place a 1/16 inch thick (1.6

mm) sheet of lead with a 5 inch

(12.7 cm) diameter hole in it on

the IRSD. Slide this lead sheet

to position the hole at the posi-

tion marked “A” (Figure 4-8).

Collimate the x-ray field to the

18 x 24 cm field size.

3. Position the probe beneath the

image receptor support relative

to the center of the hole in the

lead sheet. Raise or lower the

support stand until the probe is

exactly 5 cm below the bottom

of the IRSD. Face the probe’s

detector surface toward the x-

ray source.

4. Apply power, then set the unit

for a Manual mode exposure at

39 kV, 220 mAs, Large focal spot. Conduct the exposure and record the mR reading. If

the reading is greater than 0.10 mR, contact L

ORAD Technical Support.

5. Repeat this entire procedure for positions “B,” “C,” and “D” in Figure 4-8.

6. Install the 24 x 30 cm Bucky (if used). Repeat this test for positions “E”, “F”, “G” and “H”

(Figure 4-8) for the 24 x 30 cm Bucky.

7. If there are any readings greater than 0.10 mR, contact L

ORAD Technical Support.

6.11 X-ray Tubehead Leakage Check

This check is performed at the factory and is not required at installation. However, it will be

necessary to perform this check after repair or replacement of the tubehead housing or the

lower tubehead cover.

1. Connect a radiation scatter probe (100 square cm) to the readout/logic module of a radi-

ation rate meter.

2. Set the meter’s operating mode to read in milliroentgens per hour (mR/Hour). Place the

readout/logic module so that it can be viewed from behind the radiation shield

Figure 4-8: IRSD Shielding Check

SCATTER

PROBE

5 cm