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35040
Operators Manual
3-14
3.9.8 Using the DETECTOR SELECT Button
Pressing the DETECTOR SELECT button displays the Detector Select screen, see Figure 3-18. This
screen displays information about the selected ion chamber calibration factor. An ion chamber consists of
two text lines and an ion chamber calibration factor (ICCF) with units. All ion chambers are entered and
can be modified via the Customization Software.
The “f” cursor points to the first description string of the selected chamber. Use the UP arrow to select
the next ion chamber and the DOWN arrow to select the previous ion chamber.
Figure 3-18. The Detector Select Screen
The ion chamber calibration unit (R/C shown here) includes the radiological measurement unit (R). This
is the radiological unit that appears on the Measurement screens.
The ion chamber’s calibration unit includes the
radiological measurement unit.
If you want radiological units that are not available, use the Customization software (see Section 3.10) to
enter a new ICCF with the appropriate units.
The descriptive text should contain enough information to let the operator correctly select an ICCF that is
appropriate for the measurement desired, e.g. energy, modality, build up, etc.
3.9.9 Using the AIR DENSITY Button
Pressing the AIR DENSITY button displays the Air Density screen, see Figures 3-19 and 3-20. This
screen contains the temperature value, pressure value, and Air Density Correction Factor (ADCF). Press
the AIR DENSITY button to advance the “f” cursor to the next field. To change the value or state of an
item at the “f” cursor, use the UP and DOWN arrows. The Model 35040 Therapy Dosimeter displays the
Air Density Correction (ADC) annunciator in the upper left-hand corner of all screens if the air density
correction is enabled, see Figure 3-19.
Figure 3-19. The Air Density Screen With Air Density Corrections Enabled
To disable the air density correction, advance the “f” cursor to the ADC annunciator at the upper left of
the display. With the “f” cursor at this position, pressing the UP and DOWN keys will toggle the air
density correction on (ADC) and off (OFF).
Farmer - S/N 12345
Co-60
ICCF=4.678E+09 R/C
ADC
NOTE
ADC
22.5 C 760 mmHg
ADCF = 1.002