CHAPTER 12
202 PerkinElmer Life and Analytical Sciences
Example of
14
C in Benzene Sample Performance.
The samples were
14
C toluene in benzene cocktail (PPO 6 grams/
liter POPOP 0.2 grams/liter). Total sample volume was 3.5mL in
standard low 40K 7mL vials, prewashed with 0.1M EDTA, and
Teflon® cap liners were used.
Example of Large Volume
3
H in Water.
TR-LSC
Count
Mode
Sample
Configuration
Energy
(keV)
14
C %
Efficiency
BKG
CPM
E
2
/B
Ratio
None
Sample Only
20.0-113.0
64.99 3.62 1167
NCM Sample Only 20.5-101.5 64.03 3.28 1250
HSCM Sample Only 21.5-95.5 61.22 1.36 2756
LLCM Sample Only 19.5-95.5 54.05 0.76 3844
LLCM
(SLLCM)
Sample+BGO
Detector
10.0-75.0 70.70 0.54 9256
TR-LSC
Count
Mode
Sample
Configuration
Energy
(keV)
3
H %
Efficiency
BKG
CPM
E
2
/B
Ratio
None
Sample Only
0.0-18.6
34.2 22.3 52
NCM Sample Only
0.0-18.6
33.8 17.8 64
HSCM Sample Only
0.0-18.6
33.9 12.8 90
LLCM Sample Only
0.0-18.6
29.4 6.2 139
LLCM
(SLLCM)
Sample+BGO
Detector
0.0-18.6
26.7 2.8 255
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