MGP Instruments DMC 2000 User Manual

Users Guide for the Operational Dosimeter DMC

What is the purpose of an operational dosimeter?

The operational dosimeter (DMC) is an electronic dosimeter. It is worn in addition to the « passive »
personal dosimeter and allows you:
•
to display your integrated dose in real time,
• to warn you with a beep of variable frequency of the radiation level around you
•
to inform you when the alarm thresholds are exceeded :
o DMC2000 (cf. : Figure 1) : alarm and indicator light,
o DMC3000 (cf. : Figure 1) : alarm, indicator light and vibration,
•
to register your operational dose to allow a daily Radiation Protection follow-up of your
interventions.
The alarm threshold for the dose rate is fixed at 2 mSv/h (corresponding to the dose rate limit in a Limited
Stay Controlled Radiation Area).
The dose alarm thresholds are fixed by the Radiation Protection Group according to the regulationary
annual limits and the dosimetric estimations registered in IMPACT activities.
If you hear an alarm, you must leave the area immediately
on the site concerned:
- Meyrin : 72504
- Prévessin, SPS, LHC : 75252

Where do you have to wear an operational dosimeter?

Wearing a DMC is obligatory for all access to Limited Stay Controlled Radiation Areas and High-Radiation
Controlled Areas (cf.: Figure 2), from now on called Controlled Radiation Areas:
Figure 2: Controlled Radiation Areas where wearing a DMC is obligatory.
DMC 2000
Figure 1: Photos of the two types of DMC used at CERN.
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EDMS 1264719
DMC 3000
and contact the Radiation Protection Service