Exploranium GR-135, System Manual, Page: 52 / 80

SAIC Exploranium – GR-135 System Manual page: 52
D.RATE
– the bar display and the numeric data show the Dose Rate data. The numeric data
shown above (1234cps in the figure) is an essential tool to locate radioactive material
but the DOSE data gives the user an idea of the potential hazard level of such material.
173uR/h
– this is the numeric value of the Dose Rate in the selected units, in this case
Roentgen/h usually referred to as R/h. Many users find the numeric display useful but
some users find it’s changing units gets confusing which is why the bar graph and the
numeric data are both shown
500
- this shows the defined limit selected by the system supervisor that is the maximum
range on the bar graph. If this limit is exceeded a special alarm occurs (se below).
Note that this user is in the units selected – in the display shown – since the D.RATE is
in uR/h then the 500 = 500uR/h. At this setting, if the DOSE RATE exceeds 500uR/h
then the warning alarm will occur (see A.10 below)
- this bar graph gives the user an easy visual display of the Dose hazard level (Zero on the
left and Maximum on the right). The users technical personnel determine at what
Maximum Dose level their personnel are permitted to work in. This is then set in the
system parameters and defines the upper level of this bar graph. Once the is limit is
exceeded the user is warned – see the HIGH DOSE section A.10 below
PRESS ENTER TO IDENTIFY - pressing the JOYSTICK is referred to as ENTER, so the user is
advised that pressing ENTER will change the operating mode to the IDENTIFY mode
described below. As noted above, when the center of the radiation is located in the
SEARCH mode then the user presses ENTER to analyze the radiation as explained
below.
A.8 IDENTIFY MODE
When this mode is activated from SEARCH by pressing ENTER, a new display appears:
IDENTIFY
– shows the mode of operation (IDENTIFY)
SAMPLE IN PROGRESS WAIT
– advises the user that a sample is in progress for the time
period set in the unit so the unit should be held in a fixed position to enable a proper
sample to be taken.
OK
– this flashing box advises users of a way to get the best
sample. The system has internal parameters that assess
detector functions. If OK is shown this means that the data
accumulation is OK for good system analysis.
Alternative displays in this box are :
-
MOVE CLOSER
– means that the signal is very weak
so if possible the user should move
the unit closer to the suspect source
of radiation. In many cases this is
impossible so no action need be taken, but if possible move the unit
closer until the display shows OK
-
MOVE AWAY
– means that the signal is stronger than is necessary to take a proper
sample. Correct action is to back away until the display shows OK.
IDENTIFY
SAMPLE IN
PROGRESS
WAIT
OK
DET: NAI
TIME
1
MIN