Low-Cost Hand & Foot Monitor - Model 3276 Hand & Foot Monitor
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Introduction

The System
The Model 3276 is an ergonomic, versatile instrument that can be used for multiple radiation detection purposes. Its design allows it to be used as either a frisker or as an area monitor. In this configuration the Model 3276 Frisker/Area Monitor is connected to both a Model 44-25 Hand Monitor and a Model 44-26 Foot Monitor in a simple yet effective system.

The Detectors
The detectors used in the attached monitors are Geiger-Mueller, halogen-quenched, pancake-type sensitive to alpha, beta, and gamma radiation. The hand detector employs two G-M detectors while the foot monitor uses three such detectors.

General Features
Features include the ability to measure radiation in count rate, exposure rate/dose, activity rate, integrated exposure/dose, time-averaged rates, and scaler counts.

In addition to hand and foot monitoring, the Model 3276 can also be configured as an area monitor. Mode choices can be limited to just the RATE mode appropriate for constantly scanning the radiation level. The units can also be limited to a single set of radiation units so that the display is always showing the same measurement.

The Model 3276  features a large backlit LCD (liquid crystal display), user-programmable measurement units, piercing audio warning, and easy, intuitive use. It is not intended for outdoor use and should be protected from splashing water.

Setup of the instrument is accomplished through the front-panel buttons, or through software available from Ludlum Measurements. The advanced user or administrator can set:
  • Calibration Constant
  • Dead Time Correction
  • Efficiency
  • High Voltage
  • Pulse Threshold
  • Detector Current Overload Threshold
  • Loss of Count Alarm Time
  • Primary and Secondary Units
  • Primary and Secondary Minimum and Maximum Displays
  • Primary and Secondary Unit Alarm Levels
  • Primary and Secondary Count Units
  • Primary and Secondary Count Units Minimum Displays
  • Primary and Secondary Count Alarm Levels
  • Response Time
  • Auto-Response Rate (Fast or Slow)
  • Available Operational Modes
  • Count Time
  • Auto Shutdown Time
  • Area or Frisker Mode
  • Sigma or Click Audio Mode
Front-panel setup can be disabled via the internal switch on the Model 3276 in order to protect settings from inadvertent changes. 
 
The unit is operated with a wall-mounted DC supply that provides 9 VDC to the instrument and has interchangeable prongs to operate on 100-250 VAC at 50–60 Hz. In most areas of the world.  Four alkaline "AA" batteries supply backup power for operation from -20 to 50 °C (-5 to 122 °F).