FlowStar2 LB 514
3. Measuring Cells
31
b) Admixture method
Liquid scintillator is continuously added to the column eluate, the resulting
mixture passed through a cell and measured. Advantages of this method:
virtually no memory effects and a high counting efficiency for all nuclides
(e.g. for 3H-labels up to 50%), therefore highest detection sensitivity
(E²/BG).
The following instruments are required for this method:
Scintillator pump LB 5037
T-mixer or mixing cartridge with housing
Possibly, an analytical splitter to minimize liquid scintillator consumption
and/or to re-use the eluate
Liquid scintillator, with certain properties: it should absorb the existing
eluate without any problems; the resulting cocktail should remain trans-
parent, without jellification, crystallization or flocculation. Moreover, no
mixture gaps or luminescence must occur.
Volume:
20 µl - 1 ml
Handling:
No contamination or memory effects, additional devices required.
Identification:
Labeling example:
Z 200-6 M (microbore admixture cells with 200 µl volume)
Caution:
The outlet capillary for solid cells should have an inte-
rior diameter of at least 1.0 mm.
Please read Chapter 4.2 Connecting Steel Capillaries before
connecting an admixture cell.
