A. Poffijn (FANC/UGent) Santander July 05 Radon exposure vs exposure to other sources of ionising...
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Transcript of A. Poffijn (FANC/UGent) Santander July 05 Radon exposure vs exposure to other sources of ionising...
A. Poffijn (FANC/UGent)
Santander July 05
Radon exposure vs exposure to other sources of ionising radiation
Content• General distribution
• Man-made sources
• Natural sources
A. Poffijn (FANC/UGent)
Exposure from radiation sourcesGeneral
Source Belgium(mSv/y)
Worldwide(mSv/y)
Man-made 2,0 1,35
Natural 2,5 2,4
Total 4,5 3,75
A. Poffijn (FANC/UGent)
Exposure from radiation sourcesMan-made
Belgium(mSv/y)
Worldwide(mSv/y)
Medical 1,95 1,3
Other 0,05 0,05
A. Poffijn (FANC/UGent)
Medical exposure
Belgium(mSv/y)
Worldwide(mSv/y)
Radiology 1,78 1,2
Nuclear 0,17 0,08
A. Poffijn (FANC/UGent)
RadiologyX-ray diagnostics
• In Belgium: 1200 X-ray examinations per year per 1000 (Unscear: 920)
• Average effective dose: 1,78 mSv/y (Unscear: 1,2)
• CT: 0,96 mSv/y0
10
20
30
40
50
60
%
Type
Abdomen
Angiography
Chest
CT
GI-tract
Mammography
Spine
Other
A. Poffijn (FANC/UGent)
Exposure from radiation sourcesNaturalBelgium
(mSv/y)Worldwide
(mSv/y)
Cosmic 0,35 0,4
Externalterrestrial
0,4 0,5
Radon &Thoron
1,45 1,2
Other internalexposure
0,3 0,3
A. Poffijn (FANC/UGent)
Radon in the domestic environment (I)General
Arithmic mean(Bq/m3)
Range(Bq/m3)
Worldwide 46 5-20000
Spain 86 10-15400
Belgium 48 5-2000
A. Poffijn (FANC/UGent)
Radon in the domestic environment (II)Reference levels
New(Bq/m3)
Existing(Bq/m3)
ICRP 200-600 200-600WHO 200 200EU 200 400Spain 200 -Belgium 400 400All Europe 150-1000 150-1000
A. Poffijn (FANC/UGent)
Radon in the domestic environment (III)Sources (BE)
Source Reference value(Bq/m3)
Range(Bq/m3)
Soil 25 5-2000
Building mat. 15 5-100
Outdoor air 10 5-20
Water supply 0 0-10
TOTAL 50 15-2000
A. Poffijn (FANC/UGent)
Radon in the domestic environment (IV)
Risk mapping (BE)
• Indicative map (Rn-south > Rn-north)
• Radon survey in 10000 homes in Southern Belgium
• Geo-statistical analysis
• General risk map
SouthernBelgium
HauteArdenne
Arith. mean 80 Bq/m3 150 Bq/m3
< 100 70% 50%
100-199 24% 30%
200-399 5% 12%
400 & more 1% 8%
A. Poffijn (FANC/UGent)
Radon in Belgium.
Categories
Less than 1% above 200 Bq/m³
Less than 1% above 400 Bq/m³
1 à 5% above 400 Bq/m³
More than 5% above 400 Bq/m³
Antwerpen
Mechelen
Turnhout
Leuven
Nivelles (Br-W)
Brugge
IeperKortrijk
Oostende
Tielt
Veurne
Aalst
Eeklo
Gent
Oudenaarde
St Niklaas
Ath
CharleroiMons
Soignies
Thuin
Tournai
Huy
Liege
Verviers
Waremme
Hasselt
Maaseik
Tongeren
Bastogne
Marche
Neufchateau
Virton
Dinant
Namur
Philippeville
Roeselare
Diksmuide Dendermonde
Halle-Vilvoorde
Brussel
Arlon
Mouscron
A. Poffijn (FANC/UGent)
Radon at work (I)Reference levels
• Directive 96/29/Euratom
• Enhanced exposure to natural radiation cannot be neglected from R.P.
• Work activities Radon at work NORM Aviation exposure
ICRP 500-1500 Bq/m3
EU 500-1000 Bq/m3
Spain
Belgium 800 kBq/m3*h
Other Europeancountries
200-3000 Bq/m3
A. Poffijn (FANC/UGent)
Radon at work (II)Categories of workplaces (BE)
• All underground workplaces (mushroom galleries and visitor caves included)
• Facilities for water production, treatment and distribution
• Workplaces at ground level in radon risk areas as defined for homes
• Any other type of work place as defined by the FANC
A. Poffijn (FANC/UGent)
???
• General distribution of radiation burden:
What is the (best) way of presenting national data (population weighted ,...)
• Radon mapping :
What is the (best) way for presenting data in view of a combination at an international level? (average, geomean, percentage,…)