Neutron Dose Ratemeter

Introduction

The Model 12-4 is an industry standard neutron dose rate instrument that conforms to the RPG curve with a measuring range of 0-100 Sv/h (0-10,000 mrem/hr) from thermal to 12 MeV.
The detector is a 22.9 cm (9 in.), moderated ³He tube with a gamma background rejection up to 100 mSv/h (10 R/hr). The ratemeter is a four-decade analog meter, designed with an aluminum cast instrument housing incorporating a separate battery compartment, and accompanying metal handle. This design delivers industrial robustness and quality, promoting long-lasting protection and instrument life.

The front-panel controls include a rotary switch for selecting the four-decade range, instrument shut-off, and battery test, an audio on/off switch, a fast/slow response switch, a count reset, and high-voltage test push-button. The Model 12-4 is a complete turn-key system and includes two "D" cell batteries.

This Product is CE Certified

Spezification

INDICATED USE: neutron dose rate
MEASUREMENT RANGE: 0-100 mSv/h (0-10,000 mrem/hr)
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
SENSITIVITY: typically 10,000 cpm per μSv/h (100 cpm per mrem/hr) (bare AmBe neutrons)
ENERGY RESPONSE: provides an appropriate 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: < 10 cpm through 0.1 Sv/hr (10 R/hr) (¹³⁷Cs gamma)
OPERATING VOLTAGE: approximately 1200 Vdc
THRESHOLD: -2 mV
WORKING ENVIRONMENT: splashproof shields for outdoor use
METER DIAL: 0-10 mrem/hr, 0-2.5 kV, BAT TEST (other dials available)
HIGH VOLTAGE: adjustable from 400-2500 V (can be read on meter)
DISCRIMINATOR: adjustable from 1-50 mV
CONTROLS:
1. Multipliers: x1, x10, x100, x1000
2. Response: toggle switch for FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of final reading
3. Reset: pushbutton to zero meter
4. HV Test: pushbutton to display the high voltage on the meter
5. Audio: built-in unimorph speaker with ON/OFF switch (greater than 60 dB at 61 cm [2 ft])
CALIBRATION: accessible from front of instrument (protective cover provided)
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)
CONSTRUCTION: cast and drawn aluminum with beige powder coat finish
WORKING ENVIRONMENT: splashproof shields for outdoor use
TEMPERATURE RANGE: -20 to 50 °C (-4 to 122 °F)
SIZE: 43.2 x 22.9 x 26.7 cm (17.0 x 9.0 x 10.5 in.) ( H x W x L)
WEIGHT: 7.9 kg (17.5 lb)

Neutron Dose Ratemeter - Model 12-4

Introduction

Spezification