RSSO RefresherD. Forkel-Wirth, 25th January 2013

Radioprotection et Sûreté Radiologique

2

Rôle Départements:Piloter

accélérateur, détecteur (voiture)

Sûreté: conditions d'exploitation correctes des faisceaux et des détecteurs, système d'accès, détection incendie, système de refroidissement, manipulation de matières radioactives (réparation, entretien, transport, stockage)

Rôles RP: Conseiller, Fixer des limites,Suivre et contrôler,Intervenir en cas de problèmes….

General Principles of Radiation Protection

1) Justification

any exposure of persons to ionizing radiation has to be justified

2) Limitation

the personal doses have to be kept below the legal limits

3) Optimization

the personal doses and collective doses have to be kept as low as reasonable achievable (ALARA)

ALARA PrincipleIndividual risk level

LIMIT

ALARA

UNACCEPTABLE RISK

TOLERABLE

RISK

ACCEPTABLE LEVEL OF

RISK Specific to each

exposure situation

The 2007 Recommendations of the International Commission on Radiological ProtectionICRP Publication 103Ann. ICRP 37 (2-4), 2007

Abstract - These revised Recommendations for a System of Radiological Protection formally replace the Commission’s previous, 1990, Recommendations; and update, consolidate, and develop the additional guidance on the control of exposure from radiation sources issued since 1990.

Thus, the present Recommendations update the radiation and tissue weighting factors in the quantities equivalent and effective dose and update the radiation detriment, based on the latest available scientific information of the biology and physics of radiation exposure. They maintain the Commission’s three fundamental principles of radiological protection, namely justification, optimisation, and the application of dose limits, clarifying how they apply to radiation sources delivering exposure and to individuals receiving exposure.

The Recommendations evolve from the previous process-based protection approach using practices and interventions by moving to an approach based on the exposure situation. They recognise planned, emergency, and existing exposure situations, and apply the fundamental principles of justification and optimisation of protection to all of these situations. They maintain the Commission’s current individual dose limits for effective dose and equivalent dose from all regulated sources in planned exposure situations. They reinforce the principle of optimisation of protection, which should be applicable in a similar way to all exposure situations, subject to the following restrictions on individual doses and risks; dose and risk constraints for planned exposure situations, and reference levels for emergency and existing exposure situations. The Recommendations also include an approach for developing a framework to demonstrate radiological protection of the environment. 

CERN Reference LevelsYear Number of persons with effective doses above 6 mSv/year but below 20

mSv/year

2000 13

2001 2

2002 2

2003 5

2004 0

2005 - 2012 Number of persons with effective doses above 3 mSv/year but below 6 mSv/year

2005 8

2006 6

2007 2

2008 2

2009 2

2010 0

2011 0

2012 0

Dose objective for 2013:

3 mSv/year - a challenge due to

LS1

Individual Dose

Dose interval (mSv)

Number of Persons

Number of Persons

Number of Persons

Number of Persons

Number of Persons

Number of Persons

Number of Persons

Number of Persons

2005 2006 2007 2008 2009 2010 2011 20120.0 3074 4192 5131 5143 5042 5418 5315 59130.1-0.9 1522 1738 898 1020 1219 1514 1984 18631.0-1.9 53 37 33 40 39 31 31 232.0-2.9 9 17 2 3 13 6 7 -3.0-3.9 3 4 1 1 2 - - -4.0-4.9 4 2 1 1 - - - -5.0-5.9 1 - - - - - - -> 6.0 - - - - - - - -

Collective Dose

93 94 95 96 97 98 99 0 1 2 3 4 5 6 7 8 9 10 11 120

200

400

600

800

1000

1200

1400

Collective Personal Dose

Gamma/BetaNeutron

Col

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quiv

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t (p

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