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

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

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

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

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

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

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

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

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

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

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

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

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

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