Chapter 1 Introduction
2 Gem-5 User’s Manual
The very low detection threshold is optimized by the quantity and sensitivity of the
detectors, the thickness of the lead shielding and the measuring time, so that stringent
user requirements can be met.
The devices are rugged and reliable; and they are extremely easy to use, even for non-
specialists.
All Mirion Technologies (Canberra CA) Ltd. personnel monitors use industrial-
grade plug-in computers with internal solid-state drive, high-resolution color LCD
displays, and digitized sound for prompts and instructions. All computer
components are readily available through
Mirion Technologies (Canberra CA) Ltd.,
simplifying repair and replacement of parts. For ease of setup, calibration and
maintenance, access to the installed computer is through a conveniently located
locked access door. Computer connections inside this access door include an on/off
switch, VGA port, serial port, Ethernet port and USB ports.1
The GEM-5 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.
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 180º and repeat count, and then exit).
The user interaction with the unit for contamination monitoring is intuitive and
uncomplicated. The underlying analysis and control software is both sophisticated
and flexible. The built-in data logging and diagnostic reporting capability along with
the integral comprehensive test routines are usually the only tools needed by the
service technician.
1
A bootable Setup USB Flash Memory Stick is exclusively used as the Bootable Flash Memory device. Obtain the serial
number of the unit in question and contact your local Mirion Technologies (Canberra CA) Ltd.Service affiliate for more information.
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