Figure 2-4. IM-147/PD Calibrated Scale
c. The total-dosage range for each dosimeter is
IM-93/UD, 0 to 600 cGy, Figure 2-3.
IM-93A/UD, 0 to 600 cGy, Figure 2-3.
IM-147/PD, 0 to 50 cGy, Figure 2-4.
PART B: CHARGE A DOSIMETER
2-6. General. The dosimeter must be charged before it is put to use. It must also be charged whenever it
becomes discharged because of leakage or exposure to radiation. The dosimeter should be charged in a
dust- and radiation-free area, if possible. When the dosimeter is charged, it should not be subjected to
severe shock, excessive dampness, or high temperatures.
2-7. PP-1578/PD and PP-1578A/PD Chargers. These are two models of the RADIAC detector
charger. The PP-1578A/PD charger is the newer model. The difference between the two models is the
improved ease of operation of the newer model. Chargers are issued on a basis of one per four
dosimeters, but no more than five or less than two per company-size unit.
a. The PP-1578/PD charger (Figure 2-5) consists of mechanical and electrical parts enclosed in a
watertight metal casing. Mounted on the top of the case is a rotatable charging knob. Next to the
charging knob is a charging socket with a chuck mechanism that secures the dosimeter during charging.
A dust cap, secured to the case by a bead chain, protects the charging socket when the charger is not in
use. An adapter, which permits the charger to be used to charge United Kingdom dosimeters, is stored in
the dust cap when it is not in use.
Use the adapter ONLY when charging United Kingdom dosimeters.
A circular glass window in the bottom of the case admits light to the bottom of the charging socket. This
illuminates the calibrated scale of the dosimeter during charging. A cloth carrying case encloses the
assembled charger, adapter, and dust cap. Metal hooks on the back of the carrying case permit the
charger to be attached to the belt of the operator.