SAIC Exploranium – GR-135 System Manual page: 54
OTHER FEATURES:
A.10 HIGH DOSE
The system has a preset maximum Dose Rate level – normally set at 2000µ/R. Below this level
Dose Rates are considered acceptable for system operation. However above this level it is
recommended that users move away from the source of radiation to reduce this Dose Rate level
to an acceptable level. To make things simple, the GR-135 advises the users automatically if the
Dose Rate level goes above the preset limit.
If the level is exceeded a distinctive
audio warning tone occurs
and the display changes (see fig)
As noted the user should back away until the Dose Rate level falls
below this limit and the display warning goes away.
Note that the lower Dose Rate bar graph also shows that the
Dose rate is at or above the preset limit.
Users should be reminded that short-term operation close to the
limit has a negligible hazard level but prolonged operation
significantly above this level is not recommended
A.11 NEUTRON ALARM
If the integrated Neutron detector computes an alarm above it’s
preset alarm threshold then a Neutron Alarm is declared. A
distinctive audio warning tone occurs and the display changes
(see fig).
A.12 NEUTRONS DETECTED DURING IDENTIFY
If any Neutron activity is detected during IDENTIFY this data is
shown on the display – see Fig.
Since the IDENTIFY period is for typically 55 seconds as opposed
to the SEARCH analysis which is only for a few seconds, a weak
Neutron source may be detected in the IDENTIFY mode of
analysis where it may be missed in the SEARCH mode.
The display shows the Neutron activity in DOSE units to give an
idea of the relative intensity of the Neutron activity. However
many users set the system for counts/second (cps)
MEAS
VS 2K
TOTAL
12345
DOSE
SEARCH
4215
uR/h
PRESS ENTER TO IDENTIFY
HI RADIATION
DOSE RATE
MOVE AWAY!!
WARNING!!
MEAS
VS 2K
TOTAL 12345
DOSE
SEARCH
173
uR/h
PRESS ENTER TO IDENTIFY
NEUTRONS
DETECTED
WARNING
TYPE ISOTOPE
I ND Cesium-137
ENTER TO CONTINUE
NUCLIDE IDENT
NEUTRONS 0.452uSv/h
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