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Technical Data LB761GD Low-Level Manual Sample Changer for 200 mm Planchets

The system consists of:

Counter:
LB6307 with sample tray

Lead shielding:
100 mm thick, with 78 standard bricks,
and 4 bricks, machined.
Weight: approx. 800 kg

Alpha-Beta-Discriminator LB2021

Multi-Logger LB5310A with EPSON printer:
LB5310A including 1 high voltage unit
LB3892-42 each for measuring and guard counter.

Counting gas:
Standard P-10 gas (argon-methane 90:10),
methane on customer's request

Operating voltage: (P-10 gas)
Measuring counter 1300V
Shielding counter 1700 V

Window:
Hostaphan-foil, alu-steamed on both sides 0.4 mg/cm²

Efficiency for extended sources:
(sources 200 mm diameter, source surface 11 mm each below upper edge of the traq, the efficiency can be increased by placing the alpha source on a higher level.)
Am-241: 0.06 Bq
Sr-90/Y-90: 0.05 Bq
C-14: 0.01 Bq

Separation factors:
Spillover of beta-rate in the alpha-channel:
(Measurement with Sr-90/Y-90):
<0.01 alpha-counts per 1000 beta-counts

Spillover of alpha-rate in the beta-channel:
Depending on the type of nuclide and on self-absorption of the source. Typical value for Po-210 2 %

Dimensions of the counting chamber including shielding:
Height 270 mm
Width 600 mm
Length 600 mm
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