Neutron Count Ratemeter

Introduction

The Model 15 detects and measures alphas, betas, gammas, and neutrons. A GM detector can be selected by the user to obtain alpha-beta gamma readings. The instrument's neutron countrate measurement is provided by a ³He proportional detector that is outfitted with a removable moderator.

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 GM/Neutron Detector switch, a count reset, and high-voltage test pushbutton. The Model 15 is a complete turn-key system and includes two "D" cell batteries.

This Product is CE Certified

Spezification

INDICATED USE: alpha, beta, gamma, neutron detection
DETECTORS:
- NEUTRON
  - Detector Type: 2 atmosphere ³He proportional detector with 7.6 cm (3 in.) diameter, cadmium-lined (removable) moderator for thermal neutrons, Model 42-14H
  - Sensitivity: 55 cpm/mRem/hr, Bare ²⁴¹AmBe
  - Gamma Rejection: ≤ 10 cpm through 10 R/hr (¹³⁷Cs gamma)
  - Detection Range: thermal to approximately 12 MeV
  - Energy Response: not linear through energy spectrum (0.025-12.0 MeV)
- ALPHA, BETA - GAMMA
  - Detector Type: thin end-window GM detector, Model 44-7
  - Window: 1.7 ± 0.3 mg/cm² mica
  - Window Area: active: 6.4 cm² (1 in²), open: 5.2 cm² (0.8 in²)
  - Sensitivity: typically 2100 cpm/mR/hr (137Cs gamma)
  - Background: ≈ 40 cpm
  - Efficiency (4π): 2%-14C; 10%-90Sr/90Y; 7%-239Pu
  - Energy Response: energy dependent
- INSTRUMENT RANGE: 0-500,000 cpm
- LINEARITY: ± 10 % of true value
- METER: 6.4 cm (2.5 in.) arc, pivot-and-jewell suspension
- METER DIAL: 0-500 cpm, 0-2.5 kV, BAT TEST
- CONTROLS:
  - Multi-Selector Switch: range multiplers (x1, x10, x100, x1000), Battery Check, Off
  - Audio: On/Off switch
  - Response Time: Fast/Slow switch
  - Detector Switch: for displaying either the alpha-beta-gamma or neutron detector countrate
  - High Voltage: test pushbutton
  - Reset: countrate pushbutton
- AUDIO: built-in unimorph speaker with on/off switch, greater than 60 dB at 61 cm (2 ft.)
- CONNECTOR: series "C"
- WORKING ENVIRONMENT: normal working conditions
- POWER: 2 each "D" cell batteries, housed in sealed compartment that is externally accessible
- BATTERY LIFE: ≈ 600 hours with alkaline batteries, can be checked on meter
- TEMPERATURE RANGE: -20 to 50 °C (-4 to 122 °F)
- SIZE: 31.8 x 8.9 x 21.6 cm (12.5 x 3.5 x 8.5 in.) (H x W x L)
- WEIGHT: 3.7 kg (8.1 lb)

Neutron Count Ratemeter - Model 15

Introduction

Spezification