LUDLUM 30-4 Digital Neutron Survey Meter (0 ~ 99.9 mSv/h)

Indicated Use: Neutron dose rate 

Detector: 3He proportional detector, 1.6 x 2.5 cm (0.6 x 1.0 in.) (D x L), surrounded by a 22.9 cm (9.0 in.) diameter cadmium loaded polyethylene sphere

Measurement Range: 0 to 99.9 mSv/h (0 to 9.99 rem/hr)

Sensitivity (bare AmBe neutrons): Typically 10 cpm per μSv/h (100 cpm per mrem/hr) 

Energy Response: Provides approximate inverse RPG curve for neutrons from thermal through 7 MeV, provides response up to 12 MeV

Linearity: Reading within 10% of actual value

Gamma Rejection (137Cs gamma): < 10 cpm through 0.1 Sv/h (10 R/hr) 

LCD Display: 3 digit LCD with large 13.4 mm (0.53 in.) digits, low-battery indicator, MAX, ALARM, MUTE

Units: (k)cps, (k)cpm, (µ)(m)Sv(/h), (µ)(m)rem(/h)

Response Time: User-selectable from 1 to 60 s, Auto-Response Rate FAST or SLOW, or Fixed FAST and SLOW

Alarms: Count rate, exposure/dose, and scaler alarm setpoints adjustable over the display range

Overload: High count rate saturation protection prevents false display of lower count rates

Operating Voltage: Approximately 1200 Vdc

Threshold: -2 mV

Audio: Greater than 75 dB at 0.6 m (2 ft), approximately 4 kHz

Click Audio Divide: x1, x10, x100, x1k

Power: Two alkaline or two rechargeable “AAA” batteries

Temperature Range: -20 to 50 °C (-5 to 122 °F)

May be certified for operation from -40 to 65 °C (-40 to 150 °F)

Environmental Rating: NEMA rating of 3x or IP rating of 52 with audio hole seal option (hole seal option will reduce maximum volume by approximately 10 dB)

Size:

Display Unit: 8.5 x 8.0 x 4.8 cm (3.4 x 3.1 x 1.9 in.) (H x W x L)

Detector: 22.9 cm (9 in.) diameter REM ball with 3He detector (1.6 x 2.5 cm)(D x L)

Weight: Display Unit: 174 g (0.38 lb)

REM Ball Component: 6.6 kg (14.5 lb)

Datasheet

Manual