
LS 6000 Scintillation System User’s Manual
PN 247971-F
6-12
Isotope/DPM Libraries
Setting Up A Quench Curve
from the set and properly dispose of them. A valid quench curve can be obtained using
as few as five standards. Ten is the maximum number of standards allowed.
10. Add quenching agent to each standard in increasing amounts, making sure the quench
range of the standards covers the full quench range expected in the experimental
samples.
The same quenching agent present in the experiment or any quenching agent may be
used. Nitroethane or nitromethane are commonly used quenching agents. Figure 6.8
gives the volume of nitromethane required for H#’s of
45 to 285 in Ready-Solv
TM
HP
cocktail.
*
In 10 mL of Ready-Solv HP. For lower or higher volumes, change the volume of nitromethane in proportion to
the cocktail volume.
You are now ready to count the standards and store the quench curve in the DPM Library.
Refer to the following section to count the standards.
Counting the Standards
Up to ten sets of standards may be counted and stored in the DPM Library at once. Use the
standards prepared in the section above, sets of standards previously prepared, or purchased
quench standard sets. When single, dual, or triple label studies using the same isotopes are
performed, all quench curves for these isotopes can be set up together. The standards are
counted once and all quench curves calculated.
To count the standards:
If you have just finished preparing the standards, proceed to step 5. The desired menu is
already displayed.
Figure 6.8 Volume of Nitromethane To Use For Quenching.
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