CAPINTEC, INC. CAPTUS
®
3000
2. Constancy Test Parameters – These are provided in the Cs137 Check Source frame.
Enter the Calibrated Activity and Calibration Date in the appropriate text boxes marked
on the Cs137 standard source.
3. Chi-Square Test – Counting Time is the duration over which counts are collected each
time and Repetitions is the number of times the counts are collected. They are set by
default to a value of 60 seconds and 10 repetitions, respectively. To change these
values, click in the appropriate text box in the Chi-Square Test frame and type in the
new values. Restrict Repetition value to 5, 10, 15 or 20.
4. MDA Test Parameters
a. Click in the Select Isotope drop-down box. View the drop-down list and click on the
desired isotope. This defines the ROIs over which the activity will be measured.
Without an isotope selection, the MDA Test cannot be performed.
b. To change the default Counting Time, click in the Counting Time box in the MDA
Test frame and type in the new value.
c. To alter the values being used in the formula (as shown on the left side) for MDA
calculation, click the desired radio button in Formula frame.
Note: The default settings for Precision Factor (f) and Correction Factor (C) are 4.65
and 2.71 respectively (Knoll method). Selecting the User Defined radio button
enables the text boxes for entering your own values of ‘f’ and ‘C’.
5. Click the button or press Alt+D to save the changes or click the
button to cancel the changes made and return to Figure 5-1 Quality Assurance Main
Screen.
• To return to the CAPTUS
®
3000 Main screen from the QA Tests screen, click
the button or press the Esc Key.
• Rest your mouse close to each module title on Figure 5-1 Quality Assurance
Main Screen to read a brief description of that function.
• Setup values can be conveniently changed later if needed from any QA Test
screen.
• Keep a record of the parameters set above. To do so, click the
button on Figure 5-1 Quality Assurance Main Screen
5-4 QUALITY ASSURANCE July 14
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