Neutron Meters

Ludlum Model 15 Neutron/Survey Meter

  • End Window G-M Detector for Alpha Beta and Gamma 
  • BF³ Proportional Detector with Moderator for Neutron 
  • 4 Ranges 
  • Total Counting Range from 0 - 500,000 cpm

nuetron-ludlum15Indicated Use: Fast and thermal neutron, alpha, beta-gamma survey
Detectors: Controlled by selector switch
Neutron: Model 42-9 BF³ proportional detector with 3"(7.6 cm) diameter cadmium lined moderator for fast neutrons (remove detector from moderator for thermal neutrons)
Energy Response: Count response is not linear throughout energy spectrum (0.025 - 8 MeV)
Sensitivity: Typically 60 cpm/mrem/hr (AmBe fast neutrons)
Gamma Rejection: Less than 10 cpm through 10 R/hr
Alpha Beta-Gamma: Model 44-7 thin end window G-M detector (others available)
Window: 1.7 plus or minus 0.3 mg/cm² mica
Window Area: Active - 6.4 cm²
                     Open - 5.2 cm²
Efficiency(2pi geometry): Typically 5% - 14C; 20% - 90Sr/90Y; 15% - 239Pu
Sensitivity: Typically 2100 cpm/mR/hr (137Cs gamma)
Meter Dial: 0 - 500 cpm, 0 - 2.5 kV, BAT TEST (others available)
Multipliers: X1, X10, X100, X1000
Linearity: Reading within plus or minus 10% of true value
Audio: Built in unimorph speaker with ON/OFF switch (greater than 60 dB at 2 feet)
Calibration Controls: Accessible from front of instrument (protective cover provided)
Response: Toggle switch for FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of final reading
Reset: Push-button to zero meter
Power: 2 each "D" cell batteries (housed in sealed compartment that is externally accessible)
Battery Life: Typically 600 hours with alkaline batteries (battery condition can be checked on meter)
Meter: 2.5"(6.4cm) arc, 1 mA analog type
Construction: Cast and drawn aluminum with beige polyurethane enamel paint
Temperature Range: -4° F(-20° C) to 122° F(50° C) 
May be certified for operation from -40° F(-40° C) to 150° F(65° C)
Size: 12.5"(31.8cm)H X 3.5"(8.9cm)W X 8.5"(21.6cm)L
Weight: 8 lbs(3.7 kg) including batteries

neutron-ludlum15energy

0-500 cpm

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