
LS 6000 Scintillation System User’s Manual
PN 247971-F
5-6
Data Calculation
SL CPM % of Reference/Xtal SL CPM % of Reference
CPM/Xtal CPM Section 5 for information on these prompts. In addition, a prompt to set the
units is provided. This prompt is described below.
Units
Units allows you to enter units or any name you want printed as the final results. This name
is used in place of the %REF heading in the printout.
To change the setting, highlight “Units” and enter the desired name using up to 5 characters.
Loading Samples for SL CPM % of Reference/Xtal SL CPM % of Reference
Since the instrument has no way of distinguishing among blanks, references, and unknowns,
a convention has been established for identifying them by the sequence in which they are
loaded. An example loading sequence is shown in Figure 5.4.
If blanks are specified in the User Program as described in Background/Blank Subtraction
Section 4, the blanks are loaded first. Blanks are optional. Any number of blanks may be used.
The average is printed. Leave an empty space between the last blank and first reference; this
indicates to the instrument that the next vial encountered is a reference.
Reference standards follow the blanks. Any number of replicates of the reference standard
may be used. If more than one reference is used, the system computes the average. Leave an
empty space following the last reference. References must be used.
Unknowns follow the references. If you are using replicates, the replicates must be loaded in
adjacent positions. To indicate that one or more of replicates are missing from a group, leave
one empty position; the system recognizes the vial following the empty space as being the
first replicate of the next set.
Figure 5.4 Loading Sequence for SL % of Reference.
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