LB 761 GD α-β Low-Level Counter for 200 mm Planchets

The measuring system LB 761 GD α-β Low-Level Counter for 200 mm Planchets allows the simultaneous measurement of α- and β- activity of a sample in two separate measuring channels. The background count-rates of the system LB 761 are extraordinarily low, so that good detection limits can be achieved.

Tabs

Specifications
Components
Counter:LB 6307 with sample tray
Lead shielding:

10 cm thickness with 78 standard bricks, and 4 bricks machined, 4 pi shield to reduce ambient radiation.

Weight approx. 800 kg

Alpha-Beta Discriminator:              LB 2028-1                                                      
Counting gas:           Standard P-10 gas (Argon-Methane 90:10)
Operating voltage:

Measuring counter

Shielding counter

1300 V

1700 V

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

Efficiency for extended soures

(sources 200 mm Ø, surface 11 mm each below upper edge of the tray, the efficiency can be inreased by placing the α-source on a higher level)

241Am     

90Sr/90Y

14C

18%           

46%

26%

Background

(measured with a 200 mm tin-plated planchet)

α-channel

β-channel             

approx. 0.02 cps

approx. 0.15 cps

Spillover

β- in α-channel

 

α- in β-channel

< 0.01 α-counts per 1000 β-counts

depending on the type of nuclide and on self-absorption of the source. Typical value for 210Po 2 %

Dimensions of the counting chamber including shielding270 x 600 x 600 mm³ (H x W x L)

 

Applications

Low background system ideally suited for the measurement of alpha / beta emitting nuclides commonly used in these application areas:

  • Environmental labs
  • Health Physics
  • Radio Chemistry
  • Physics
  • Occupationals Health
  • Industrial Safety
  • Food & Drug Analysis
  • Nuclear Medicine
Download
Brochure
Format Size
Flyer LB 761 en PDF 614.07 KB