Sedecal SHF-310 - Fluoro Calibration

HF Series Generators
Calibration
CA-1036R2
45
2.7 FLUORO CALIBRATION
This generator uses Pulsed Fluoro at fixed or variable rate. This technique is
a series of short exposures at the TV frame rate (fixed rate) or at the selected
PPS (variable r ate).
Fluoro exposures are controlled by kV with a constant filament current. The kV
values are manually (Manual mode) or automatically (ABC mode) adjusted to
obtain the desired brightness (entrance dose rate) on the Image Intensifier.
The Fluoro calibration consists of setting values in the corresponding Extended
Memory Locations for Fluoro use. The following table indicates the relationship
between Fluoro and Extended Memory Locations.
FUNCTION MEMORY LOCATIONS
Fluoro Filament Setting E17
Maximum Fluoro kV E19
Fluoro mA Display Calibration at 50 kV E25
Fluoro mA Display Calibration at 80 kV E26
Fluoro mA Display Calibration at 120 kV E27
The functions of these extended Memory Locations are:
• E17 is used to store data that controls the Maximum Skin Dose Radiation
at the following maximum levels (Regulation limits) (1 Rad = 8.7 mGy).
G 5 R/min (43.5 mGy/min) for systems working with Manual mode
(Non-ABC).
G 10 R/min (87 mGy/min) for systems working with Automatic mode
(ABC).
Note that in practice, the rejection limits for entrance exposure rate must
be somewhat less than the maximum specified due to Dosimeter
calibration accuracy. (RefertoTable2-2.)
Table 2-2
Rejection Limits Based on Meter 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)