GEM 5 Gamma Exit/Entrance Monitor

Features

• “Best in Industry” sensitivity
  - Eight identical large plastic scintillators
  - Three per side
  - One top/bottom
• 25 mm (1 in.) lead shielding
  - Lead is provided as ingots for easy field installation
• Additional second set of lead shielding available for areas with higher background conditions
• Integral (Embedded Windows® XP) computer
  - Requires no external PC for setup/calibration
  - Fully LAN ready (networkable)
• Color LCD screen and annunciator lights
• Voice prompts for ease of use
• Bi-directional operation (i.e., approach from either direction)
• Continuous automatic background subtraction
• Built in support for “Optimize Gamma HV”

Optional

• C-Remote software for remote control from central location available

Description

The GEM-5 is the newest instrument in the CANBERRA line of gamma exit monitors. It provides power plants and nuclear facilities the very latest gamma detection capability to monitor pedestrians leaving areas of potential radioactive contamination. User friendly – no user interface required during normal operation. Voice annunciator guides individuals through the monitoring process. An audible alarm notifies individuals of contamination and a new larger easy to see color LCD screen readily displays contaminated areas. With the optional C-Remote software, two-way radio and one-way video communications are available.

For ease of setup, calibration and maintenance, access to the installed computer is through a locked access door on the front of the monitor. Computer connections inside this access door include an on/off switch, VGA port, printer port, keyboard port, mouse port, dual USB ports, and compact flash port.

Overview

The monitor is designed to be operated in one of three different modes depending upon the level of detection capability needed. These are:
1. Walkthrough (monitor determines MDA based on user settable parameters).
2. Pause-and-count (enter the monitor, wait for a user settable length of time, then exit).
3. Two-step (stand facing the detectors for a short period (time user settable or calculated by monitor), turn 180^o and repeat count, then exit).
The contamination level at which the monitor can be set to accurately alarm is different for each of these modes. The sensitivity will differ depending upon the isotopes, background and count times.