Ludlum Model 43-68 100cm^2 gas proportional detectorAPPLICATION: alpha beta radiation survey RADIATION DETECTOR: rechargeable gas proportional EFFICIENCY (4): 20% 239Pu; 30% 99Tc; 30% 90Sr 90Y; 15% 14C; < 1% gamma SIMULTANEOUS ALPHA BETA COUNTING: 17. 5% 239Pu; 20% 99Tc; 20% 90Sr 90Y WINDOW: 0. 8 mg cm aluminized mylar (other thickness available) WINDOW AREA: 126 cm (19. 5 in) active, 100 cm (15. 6 in) open RECOMMENDED COUNTING GAS: P 10 (10% methane, 90% argon) GAS RECHARGE: will operate on a static

Indicated Use: Alpha beta gamma survey

Planchet heating incorporates welded thermocouple for best temperature reproducibility

Pro is a Free App in the Apple store

0025 eV (thermal) to about 10 MeV

4 pi and 2 pi efficiencies

Stand-alone device or integrated into a dosimetry system

9% 14Cs Window Size 1

or those currently sold new

An adjustable discriminator and an adjustable window allow the user to count pulses within a user specified energy range

) Typical Sensitivity (137Cs) 175 cpm per µR/hr Energy Response Energy dependent Alarm Indicated by red lamp and audible tone High Voltage Adjustable from 200 to 1500 Vdc Threshold Adjustable from -6 to -32 mV Linearity ±10% of true reading Meter Dial 0 - 3 µR/hr

Pro App is in the apple store here:

or we can sell select parts as needed