Owner`s manual

Operator manual REX-***R(F)
LISTEM Corporation 8/90
Maximum Permissible Dose (MPD)
Many kinds of researches on effects or influences about X-radiation provide basics
about maximum permissible dose. These research results were used for ICRP to
recommend Maximum Permissible Dose but it is hard to define exactly and it is
updated from time to time with new research result. For occupational exposures, the
ICRP 60 recommends that the MPD accumulated shall not exceed the following
limits:
▷ Annual effective dose 50 mSv
▷ Annual dose for the lens of the eye 150 mSv
▷ Annual dose for all other parts of body 500 mSv
User radioactivity dose measurement
It is valuable information to measure individual radioactivity exposure dose of
equipment operators to determine appropriateness of current radioactivity protective
method. In other words, it shows inconsistence or potential future danger of current
radioactivity protective methods.
The most effective way to determine appropriateness of existing protective method is
using exposure dose measuring device. The measurement participants must be able
to attach these measuring devices anywhere on the body that is exposed to
radioactivity. Radioactivity exposure can never exceeed maximum permissible dose.
Operators are recommended the use of personal radiation dosimeters to determine
whether personnel have been exposed to excessive radiation. This is using very
sensitive films or fluorescent material in folder. This method can only measure the
exposure of attached parts of the body but it is a very rational way to measure
radioactivity exposure.