CAPINTEC, INC CRC
®
-25R
DECAY CALCULATION
This utility is used to calculate the activity of a source at a different time (either in the past or
the future).
From
Figure 14-2 Calculations Menu select DECAY CALC. Figure 14-5 Choose Nuclide for
Decay Calculation Screen
will appear.
CHOOSE NUCLIDE
Press NUCL or
Pre-set nuclide key
or User key
or CAL# for Half-Life
Figure 14-5 Choose Nuclide for Decay Calculation Screen
Choose the nuclide via the NUCL key, one of the Pre-Set Nuclide keys or an assigned USER
key.
Figure 14-7 Decay Calculation Activity Entry Screen will appear showing the nuclide
name and half-life. In the example, Tc99m was chosen.
If you want to perform the decay calculation for a nuclide which is not in memory, press the
CAL# key.
Figure 14-6 Entering Half-Life for Decay Calculation screen will appear.
HALF LIFE:
value unit
_ MIN
-> to change unit
ENTER to Accept
Figure 14-6 Entering Half-Life for Decay Calculation
Input the value of the half-life and then press the RIGHT ARROW (Ô) key. Use the arrow
keys to scroll the half-life from Min to Year to Day to Hour. If the value needs to be changed,
press the CE key.
When the value and unit are correct, press ENTER.
Figure 14-7 Decay Calculation Activity
Entry Screen
will appear showing the input half-life. In the example, Tc99m was chosen. (If
the CAL# key was pressed (to input the half-life), the nuclide name will be blank. Only the
half-life will be displayed.)
July 07 CALCULATION UTILITIES 14 - 3
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