assistance mission, and personnel assigned to mission where exposure
to low-radiation dose is possible.
d. Dosimeters.
All models are self-indicating, direct-reading, pocket dosimeters.
They are a hermetically sealed assembly in a metal barrel, (Figure
5-1).
Figure 5-1.
Dosimeter
(1)
Optical System.
The optical system, (Figure 5-2), consists of an eyepiece lens and an
objective lens. The eyepiece lens gives a magnified view of the
calibrated scale. The objective lens gives a greatly magnified view
of the shadow of the indicating fiber.
(2)
Charging End.
Light enters the dosimeter through the charging end, (Figure 5-2), and
illuminates the field of view.
(3)
Protective Cap.
A protective cap, (Figure 5-2), is fitted over the charging end to
prevent foreign matter from entering the dosimeter. If the cap is
made of a clear material that allows light to pass through, you may
read the dosimeter with the cap on. When the cap is made of any other
material, you must remove it to take a reading. If the protective cap
is lost or defective, replace it with clear cellophane tape or similar
material.
3.
The indicating system in the dosimeter consists of a quartz fiber
(indicating fiber) and a fixed support wire, (Figure 5-2). A charge
placed on the conducting system causes the fiber to
5-3
IS0345
Previous Page
