LB 9507 Chapter 1: System Description
1-9
1.4 Sample Tubes
The Lumat LB 9507 uses sample tubes with the nominal
dimensions 12
∅ x 75 mm length with round bottoms. However,
due to the special requirements of luminescence measurements
not every type of sample tube can be used.
The permissible diameter variation is limited to a range between
11.5 and 12.1 mm; the length of the tubes may vary from 75 to 76
mm.
Basically, all materials with good transparency, such as
polystyrene, glass and polyethylene may be used. However, some
tube types show a higher and, moreover, fluctuating background
caused by electrostatic charging and phosphorescence.
To prevent electrostatic charging we recommend using sample
tubes with antistatic additives. These can be purchased from
Berthold Technologies.
Phosphorescence can be avoided by not exposing the tubes to
short-wave light prior to measurement. In general, there is less
interference if the tubes are moistened prior to the measurement,
for example during the preceding sample preparation. Never
change the tube type within an assay!
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