biodex ATOMLAB 500, Operation And Service Manual, Page: 69 / 212

To Adjust The Dial Value:
1. From the measurement screen, touch the displayed isotope name next to the
activity measurement. The dial value adjustment screen is displayed.
2. Place the known activity isotope sample into the detector. The activity is displayed on
the screen.
3. Use the <
▲
> and <
▼
> arrows to increase or decrease the dial value setting. Holding
the button increases the scroll speed.
4. When the live activity reading matches the known activity of the sample, the dial value
displayed is the dial value that should be used for this isotope and container
configuration.
NOTE: Write down the determined dial value before exiting this screen as the dial value will
not be saved.
5. The <Reset> button sets the dial value back to the default value. <Back> returns the user to
the measurement screen, sets the dial value back to the default value, and closes the dial
value adjustment screen. The user can touch the isotope name to return to the
measurement screen and the default isotope value.
NOTE: The dial value adjustment is not stored when the user exits the Dial Value
Adjustment screen. The user must access Utilities to change and save a dial value.
Zero Background
Figure 5.4.
The Zero Background screen.
Figure 5.5. A Zero Background Count in Progress.