DETECTOR EFFICIENCY
To Enter A Detector Efficiency
1. From any screen, click on the <Isotope> icon in the primary tool bar. The Isotope Editing screen will
be displayed.
2. Click on <Detector Efficiency> at the bottom of the screen. The Detector Efficiency screen will be
displayed.
3. At the Detector Efficiency screen, double click on the box next to the appropriate detector and key in
the new detector efficiency value. The value entered will be the efficiency used for the isotope
indicated in the isotope window. Each isotope must be set individually for an isotope efficiency.
NOTE: If the efficiency is less than one (1), it must be entered in decimal format (i.e., 0.1, 0.2, etc.)
4. Click on <Close> to return to the Isotope Editing screen.
To Select a Factory Default Detector Efficiency
NOTE: The following procedure is for selection of a factory default detector efficiency which was obtained using an
analytical approach to efficiencies for a sodium iodide detector.
1. From any screen, click on the <Isotope> icon in the primary tool bar. The Isotope Editing screen will
be displayed.
2. Click on <Detector Efficiency> at the bottom of the screen. The Detector Efficiency screen will be
displayed.
3. Highlight the appropriate detector and the appropriate isotope.
4. Click on <Factory Default>.This will place the analytically determined factory default value into the
appropriate detector window.
5. Click on <Close> to return to the Isotope Editing screen.
To Calculate a Detector Efficiency for a Specific Isotope
1. From any screen, click on the <Isotope> icon in the primary tool bar. The Isotope Editing screen will
be displayed.
2. Click on <Detector Efficiency> at the bottom of the screen. The Detector Efficiency screen will be
displayed.
3. To calculate a detector efficiency for a specific isotope, a sample of the activity with a known
calibration date and time must be prepared. Enter this activity (preferably in microcuries) in the
assay window at the bottom left of the Detector Efficiency screen.
NOTE: If the activity is less than one (1), it must be entered in decimal format (i.e., 0.1, 0.2, etc.)
4. Enter the date and time of calibration of the standard. Today's activity at the current time is shown
in the window below the assay window.
NOTE: Click <Now> to instantly make current the date and time for the activity shown. This is convenient if
you are making up a standard which you wish to count. You can then adjust from the current time to the
calibration time of your standard.
CONTENTS
ADMINISTRATION 3-18
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