Step 4.
If the leakage rate is greater than 12 cGy per day for
the IM-93/UD or IM-93A/UD, or 4 cGy per day for the
IM-147/PD, or 10 Gy (1 mrad) per day for the IM-
9E/PD, clean the charging end of the dosimeter and dry
it by rapidly waving it in the air.
Step 5.
Recheck the leakage rate following Steps 1 through 4.
If the leakage rate is still greater than the values
given in Step 4, the dosimeter is defective and should
be replaced.
PART C -READ RADIATION DOSE TAKEN WITH A DOSIMETER
1.
The IM-93/UD.
The IM-93/UD, the standard tactical dosimeter, is issued on the
general basis of two per platoon. If elements of a platoon-size unit
operate separately, a wider issue of dosimeters may be made. Primary
and alternate unit dosimeter wearers are assigned for each dosimeter.
This allows the dosimeter to remain with the platoon when the primary
wearer leaves the platoon area. When selecting personnel to wear the
dosimeter you should select personnel who will be doing the same tasks
as most of the other soldiers. The unit dosimeter wearer uses a
charged dosimeter to take readings during or after suspected exposure.
2.
The procedure for reading the calibrated scale is:
a. Look
at
a
light
source
through
the
eyepiece
lens
of
the
dosimeter.
b. Rotate the dosimeter until the calibrated scale is in the
horizontal position.
c. Note the
position
of
the
show
(indicating
fiber)
on
the
calibrated scale.
d. Determine the amount of radiation detected.
The amount of
radiation detected in Figure 5-10 is 130 cGy.
3.
When the dosimeter is read, the dosimeter wearer makes a note of
the reading. The next time the dosimeter is read, the wearer will
also make a note of the reading and report only the difference between
the two readings.
EXAMPLE: If the reading on the calibrated scale of the IM-93/UD is 70
cGy at the first reading and 110 cGy at the second, the total
radiation exposure for the later period is 40 cGy.
5-13
IS0345
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