
LS 6000 Scintillation System User’s Manual
PN 247971-F
a-1
Instrument Specifications
Efficiency
a
a
Instrument Specifications
a.1 Efficiency
These specifications are applicable only for Beckman calibrated standards traceable to the
National Bureau of Standards. The LS counter must be properly calibrated.
a.2 H# Plus
H# Plus reproducibility is measured relative to a
3
H quench curve set up with a wide open
window.
a.3 Maximum Count Rate For Reproducible H#
These values are for the minimum allowable volume for each of the three ranges.
a.4 Maximum Count Rates
The hot sample reject will not allow the counting of samples that are so radioactive (“hot”)
that they will give incorrect CPM. The hot sample reject criteria are:
3
H:
14
C:
60% in a wide window≥
95% in a wide window≥
Reproducibility
1% Counting Efficiency±
Isotope Standard Vials
(18-5 mL)
Miniature Vials
(6-1 mL)
Microfuge Tubes
(1.5-0.2 mL)
3
H: 10 x 10
6
dpm 4 x 10
6
dpm 4 x 10
6
dpm
14
C: 6 x 10
6
dpm 2 x 10
6
dpm 10 x 10
4
dpm
32
P: 2.8 x 10
6
dpm 18 x 10
4
dpm 3 x 10
4
dpm
Total singles:
26 x 10
6
CPM
Coincident counts (in 3H window):
10 x 10
6
CPM
Coincident counts (in
14
C window): 13 x 10
6
CPM
Coincident counts (in window above
14
C): 5 x 10
6
CPM
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