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F3 – Setup Menu

Gem-5 User’s Manual 105

Count Gamma Body in 2 Steps: This feature can be used to reduce the monitoring

time if a Gamma body detector is controlling the count time. The default is “YES”.

Unless OPERATING in the Two-Step mode, then the default is “No”.

When set to “YES” then each gamma (full) body zone's Tg is used when determining

count time (T

). A gamma (full) body zone contaminated in position 1 is marked

Contaminated.

Krypton Mode Service: This item is visible only if Krypton Mode Support is set

to “Yes” on the F1 – Model Selection screen (on page 18) and set to “Gamma(3)” on

the Alarm Settings Screen to enable Krypton mode. Krypton mode offers features

that allow the monitor to operate in an environment that periodically experiences high

background conditions, such as when Krypton or other radioactive gas is present.

Refer to page 66 for a description of Krypton Mode service.

Approach Sensor during Initialize Background: Choices are "Ignore" and "Stay

Back" (default). This is intended to encourage people to stay back out of range of the

approach sensor while background is initializing and keeps the background data from

being updated while the sensor is active.

Measurement Variance Ratio Limit Exceeded: Choices are “Notify Background

Change (Detectors)” (default), “Notify Background Change (All Zones)” and

“Ignore”.

This item defaults to “Ignore” while operating in “Walk-Through” mode

Note: Three conditions are applied. First, if zone is not allowed to alarm then it is

also not allowed to notify background change (F3 – Setup, F3 – Detection

Zones, F2 – (Zone) Settings screen on page 116, Zone Alarm set to “NO”).

Second, if a zone is contaminated with its variance ratio below the limit then

all Background Change notifications are cancelled. Third, if a High

Background condition is detected on one or more zones then all Background

Change notifications are cancelled.

Numeric Notation: Choices are “Engineering” (default) and “Scientific”. See Table

24 on page 318 for examples.

Mirion Technologies GEM-5 User Manual

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