Freiberg
Instruments
GmbH
ּ Am St. Niclas Schacht 13 ּ 09599 Freiberg – Germany
59 / 78
1.3
Beta radiation source
The current design of the beta radiation source features a circular arrangement of 17 single
miniaturized, sealed beta sources (see table 1). These single sources are inserted into a
circular groove (fig. 8). A stainless steel foil of 25 µm thickness, that is micro-laser welded to
the body, fixes the sources in the groove. The two main components
– the source carrier and
the source body with cover foil
– are affixed to each other by means of three special screws
(see figures 7 and 8). All of the components are made of stainless steel.
The radiation source provides an absorbed dose rate of 0.1 Gy·s
-1
to the sample. The
radiation field inhomogeneity is less than ± 3 % over a sample diameter of 10 mm.
Fig. 7
Radiation source (schematic): red
– circular arrangement of 17 miniaturized
sources, blue
– radiation exit window, 25 µm stainless steel, micro-laser welded
to the body; outer diameter 25 mm, height 9.5 mm, material: stainless steel
source carrier
body with cover foil
Fig. 8
Left: Components of the radiation source (individual miniaturized sources not
shown), right: assembled source with laser engraving
