1. Radiation Protection for the Beam Line 4 Schools project
Robert Froeschl (HSE/RP)

2. Goals Radiation Risks Radiation Protection Rules
East Area – T9 Experimental Area specific
SIR course: Radiation Protection – Supervised Areas
Answer your questions
BL4S – RP presentation
15/09/2016

3. Residual radioactivity (resulting)
Radiation at CERN
Accelerator in operation:
The interaction beam-matter generates stray radiaton
Accelerator stopped:
The interaction beam-matter has made the matter radioactive (activation)
Stray radiation
Residual radioactivity (resulting)
Stable matter
Radioactive matter
Beam
Stray radiation
No Beam
BL4S – RP presentation
15/09/2016

4. Ionising Radiation in/around the Accelerators
Experimental hall:
Accelerator in operation
Primary beam
Secondary beam
Beam tunnel:
Experimental area:
BL4S – RP presentation
15/09/2016

5. Ionising Radiation in/around the Accelerators
Experimental hall
Accelerator in shut down
Radioactive accelerator
Beam tunnel:
Experimental area:
BL4S – RP presentation
15/09/2016

6. Radiation Areas at CERN
Areas with risks due to ionizing radiation are classified as "Radiation Areas". Radiation Areas at CERN are clearly marked with yellow panels. Corresponding to the risk level, Radiation Areas are subdivided into:
"Supervised Radiation Areas“ (<15μSv/h - low risks)
"Controlled Radiation Areas“ (elevated risks)
East Hall is a Supervised Radiation Area
BL4S – RP presentation
15/09/2016

7. East Hall – T9 Experimental Area
All material leaving the East Hall must be controlled by RP.
Globally in the building:
New Control Room for T9
Experimental
area T9
Dismantling activities in this area
Pedestrian
Pathway
BL4S – RP presentation
15/09/2016

8. CERN’s Personal Dosimeter (RADOS DIS)
The personal dosimeter at CERN:
Obligatory in Supervised Radiation Area
Registered to a person
Non-transmittable
Dosimeters will be handed out after successful SIR training
Dosimeters can be read out by yourself using Dosimeter Readers
e.g. in Restaurant 1
RFID Chip : access system
Integration of the neutron dose (track dosimeter)
Continuous measurement of the β/γ dose (DIS system)
Dosimeter Reader
BL4S – RP presentation
15/09/2016

9. Dosimetry - Reference Levels
Annual exposure in μSv
99 % of the doses at CERN
are inferior to 1000 μSv/year
Whole body scan
10’000 μSv
Yearly effective dose due to
natural radiation in granite zones
3000 μSv
Yearly effective dose due to natural radiation
2000 μSv
Lung x-ray
100 μSv
Plane trip Paris-New York
50 μSv
BL4S – RP presentation
15/09/2016

10. Radiation - How to protect yourself
SHIELDING
Adequate shielding will reduce the dose received. Specific material is necessary against each type of radiation. Concrete is effective against all types.
TIME If you reduce
the exposure time,
you reduce the dose.
DISTANCE
The further you move away from the source, the more the dose decreases.
BL4S – RP presentation
15/09/2016

11. Radiation Protection - General Principles
Do not start activities which are not directly relevant to the work
Respect markings and the information given on signs
       
BL4S – RP presentation
15/09/2016

12. Radiation Protection - General Rules
In a Supervised Radiation Area it is forbidden to drink, eat or smoke.
BL4S – RP presentation
15/09/2016

13. Alarms In Supervised Radiation Areas - Two Types of Displays
Flashing light + ALARM
 Evacuate the area calmly
Flashing light
WARNING  Limit your stay
Flashing RED light + ALARM
 Evacuate the area calmly
Flashing ORANGE light + WARNING SOUND
 Limit your stay
Continuous green light = NORMAL situation
(low radiation levels, system OK)
BL4S – RP presentation
15/09/2016

14. Questions? Summary Prompt and residual radiation
Time, Distance, Shielding
RP Rules for Supervised Radiation Area
Personal Dosimeter
Forbidden to drink, eat or smoke
Material leaving the zone has to be controlled
Questions?
BL4S – RP presentation
15/09/2016