Fluke Biomedical 06-526 - Manual (Page 14)

Nuclear Associates 06-526 & 06-526-2200
Operators Manual
2-6
130 3.5
140 3.8
150 4.1
2.7 MAS Reciprocity
At any given kVp, combinations of time and mA that yield equal mAs values should produce equal
exposure (output) values.
1. Make an exposure at each mA station, varying the time to maintain mAs constant. Do not adjust
kVp.
2. Record the exposure value obtained.
Variations exceeding the 10% average value may indicate the need for equipment re-calibration.
2.8 Fluoroscopic Exposure Rate
1. Position the RAD-CHECK PLUS with the detector circle facing the x-ray tube (inverted for under-
table tubes).
2. Using the optional 07-706 Patient Phantom (or equivalent), place two 3/4 inch aluminum
attenuators between the RAD-CHECK PLUS and the image intensifier.
3. Center the detector in the fluoroscopic beam as follows:
a. Turn on the x-ray beam at a low mA setting.
b. Use the image intensifier to view the RAD-CHECK PLUS image.
c. Press the RATE button on the RAD-CHECK PLUS front panel.
d. Turn the fluoroscope on and read the display.
To prevent damage to the image intensifier, the
aluminum attenuators must be in place while
making an exposure.
4. Place a 1/8 inch lead beam stop plate (also included in the 07-706 Patient Phantom) or equivalent
(folded lead apron) between the RAD-CHECK PLUS and the image intensifier tube. This drives the
automatic brightness control to maximum output.
On equipment without automatic brightness
controls, select maximum output settings.
21CFR1020 requires that the maximum exposure
rate be less than 10 R/min (Cg/min).
CAUTION
NOTE