SAIC Exploranium – GR-135 System Manual page: 75
13. User can now press ENTER and return to the normal SEARCH mode
14. If CONTAMINATION is detected - at the end of sample the display will show “WIPE TEST
CONTAMINATION ABOVE ALARM LEVEL – LEVEL = 55”.
In this case removable contamination has been detected so the
GR135 must be thoroughly cleaned to remove any potential
contamination before further use.
15. HIGH DOSE RATE
The above process works correctly as long as the local Radiation background Dose Rate is below
20uR/h. To prevent this being an issue the system will give a special warning as follows:
The process is:
1. Press ENTER until the display shows the SEARCH mode. The bottom of the display shows
“UP=WIPE ENTER=IDENTIFY”
2. Click UP (for WIPE). The display shows the message “BACKGROUND NEEDED –
MOVE AWAY FROM VEHICLE THEN PRESS ENTER”
3. Move the GR135 at least 10ft away from any vehicle then press ENTER
4. At this time if the local Background is above 20uR/h the display will show the message
“DOSE RATE TOO HIGH – MOVE TO LOWER BACKGROUND”. The user must move
to an area where the background is lower.
5. Recommended method is to press ENTER a few times to move back to the SEARCH mode
and move until the GR135 shows that the Dose Rate is below 10uR/h – then start the test
again with UP from the SEARCH menu
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