Sedecal SHF-310 - 2.10 Fluoro Check

HF Series Generators
Maintenance
MA-1004R4
17
2.10 FLUORO CHECK
Fluoro functions are calibrated by performing the following steps:
1. Turn the Generator ON.
Make sure that the Small Filament of the X-ray tube is properly
warmed-up.
2. Set up a Dosimeter to measure the Maximum Entrance Skin Exposure
Dose Rate. Position the Probe at the center of the primary beam with the
entire active volume within the primary beam. Place the Tube-Collimator
Assembly as close as possible to the Table-Top, fully open the Collimator
Blades and align the Image Intensifier with the light beam. Block radiation
input to Image Intensifier with a Lead Apron. (Refer to Illustration in
Fluoro Calibration).
Note that in practice, the rejection limits for entrance exposure r ate
must be somewhat less than the maximum specified due to
Dosimeter calibration accuracy.
METER C
A
LIBR
A
TION
REJECTIONS LIMITS
M
E
T
E
R
C
A
L
I
B
R
A
T
I
O
N
ACCURACY
FOR 5 R/min (43.5 mGy/min) MAXIMUM FOR 10 R/min (87 mGy/min) MAXIMUM
±5%
4.75 R/min (41.3 mGy/min) 9.5 R/min (82.7 mGy/min)
±10%
4.50 R/min (39.2 mGy/min) 9.0 R/min (78.3 mGy/min)
±15%
4.25 R/min (37 mGy/min) 8.5R/min (74mGy/min)
3. For testing the Dose, make a Fluoro exposure at maximum kV and
measure the dose applied, it should not be over the Rejection Limits for
5R/min(43.5mGy/min)or10R/min(87mGy/min)(refer to the above
table).
In case that the value is not acquired, perform the respective Fluoro
calibration process.
Note .