Berthold LB 134 - Page 95

LB 134 7. Probes for the LB 134
85
Technical data:
Sensitive
detector area
LB 1342:118mm x 145mm, 170 cm²
LB 1343: 150 mm x 230 mm, 300 cm²
Entrance
window
Layer thickness: 6um
Weight per unit area: 0.4 mg/cm²
Geometric
transmission
80%
Background
LB 1342: Alpha channel: approx. 0.1cps,
beta channel: approx. 10cps
LB 1343: Alpha channel: approx. 0.1cps,
beta channel: approx. 15cps
Sensitivity to 1
µSv/h external
gamma radiation
(Cs 137)
Alpha channel: not detectable
Beta channel: < 100cps
Spillover
Alpha into beta channel (Po-210): < 20%
Beta into alpha channel (Sr-90): < 2*10
-5
Measuring range
(linearity devia-
tion error
< 10%)
Alpha channel: 0 – 5 000cps
Beta channel: 0 – 50 000cps (for alpha channel
< 750cps)
Local variation
Responsiveness
Both channels: 20%
Temperature
range
Temperature range operation: -20°C ... +40°C
(no condensation)
Stability of background over T-range: 10%
Temperature range storage: -40°C ... +60°C
Protection type
IP53
Overrange
indication
β: >50000cps Overrange Indication
α: >5000cps Overrange Indication
Light-proof/
Entrance
window
Sunlight <10cps
External
magnetic fields
Close to PC monitor no visible influences