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14. Disturbances
FlowStar2 LB 514
122
Possible reasons and solutions:
The newly installed solid cell has not yet decayed (mainly with YG,
J-1000, BGO-x cells).
Wait until the cell has decayed.
The solid cell is contaminated.
Replace cell or decontaminate it.
Light incidence in counting chamber.
- O-ring seal defective (replace it on the front side of the counting
chamber)
- Teflon or other plastic capillaries (e.g. PEEK capillary) are used
as inlets or outlets. Cover capillaries with black shrinking tube or
insulation tape (several layers, min. 30 cm) or use stainless steel
capillaries.
Please note that PEEK capillaries are not light-tight! A black 15
cm long black protective hose may help. We recommend using
“Norprene®”, a black silicon like hose with an external diameter
of 4 mm and an internal diameter of 2 mm to cover the PEEK
capillary.
The Norprene® hose is used with the scintillator pump (LB 5037)
as inlet hose.
-
Luminescence effects in cell (see next section)
Increased BG after start of eluate.
Activity is continuously washed off the column (column is bleeding).
Check: collect 1 ml eluate and measure it in LSC1.