Figure 7.14: NaI Scintillation Probe LB1234 for the LB134
Technical data:
Scintillator: 1“ x 1“ NaI crystal
γ-response: 250 cps per μSv/h in
137
Cs radiation field
3000 cps per μSv/h in
241
Am radiation field
Background: approx. 30 cps at 100 nSv/h
γ-ambient level
Energy range: 25 keV to 2 MeV (wall material
0.5mm aluminum)
Dimensions: Ø 40 mm x 305 mm (rear Ø 50 mm)
Temperature range: -10°C to 40°C
Protection type: IP 65 (according to DIN IEC 60529)
Electronics: PMT, active voltage divider,
high voltage supply and charge sensi-
tive preamplifier with discriminator
7.8 Activity Probe for Solid Samples LB 1238
The proportional end window probe LB 1238 is used for activity
measurements; it is suitable for alpha-beta measurements. It
can be used as portable probe (e.g. in chromatography) or sta-
tionary for solid sample measurements, such as planchets or
wipe tests. The probe consists of an amplifier/HV generator with
alpha-beta pulse height discrimination in a cylindrical case with
built-in end window proportional counter tube type Vacutec
70020 (window diameter = 29 mm). It has two pulse outputs,
one each for the alpha and one for the beta rate. The probe can
be inserted in the small lead chamber LB 7411 to measure
planchets up to 25 mm diameter.
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