History
16th century
Jáchymov (Joachimstahl), silver mine: Paracelsus described a „miners desease“
1952
W.F.
Bale (USA) discovered the reason: inhalation of short-term radon decay
products; the discovery was followed by first epidemiological studies
(in the Czech republic organized by J. Ševc)
1956
S. V. Hultquist (Sweden) observed high indoor radon concentrations
80's
high
indoor radon concentrations observed in Czech houses, at first in
houses built from materials with higher content of 226Ra (slag
concrete; START houses)
1990
the first governmental resolution about radon (No. 150, May 1990)
the first proposal of the uniform method for radon risk classification of foundation soils
radon maps in scale 1:200 000
1991
acceptance
of the Decree of the Ministry of Health of the C.R. on the requirements
for limiting radiation exposure due to radon and other natural
radionuclides (No. 76/1991)
action level 200 Bq/m3 (EEC) for existing houses
guidance level 100 Bq/m3 (EEC) for new buildings
preventive investigation levels, 226Ra in building materials and 222Rn in supplied water
governmental
resolution about the purchase and remediation of START houses (building
materials with higher content of 226Ra - No. 520, December 1991)
guidelines of the Ministry of Finance - the rules for purchasing and supporting remediation activities
complete set of uniform measurement methods
1993
governmental
resolution supporting the search for high radon houses and remediation
in schools and action on water supplies (No. 709, December 1993)
1994
modification of the origin proposal of the classification method for radon risk classification of foundation soils
1995
competency
in the field of radiation protection transferred from the Ministry of
Health to the State Office for Nuclear Safety (the Law No. 85/1995)
Czech National Standard CSN 73 0601 Protection of houses against radon from the soil
1997
Atomic Law (No. 18/1997) - regulation and control of all possible radon sources
Decree of the State Office for Nuclear Safety No. 184/1997 on requirements of radiation protection
Czech National Standard CSN 73 0602 Protection of houses against radon and gamma radiation from building materials
1998
modification of methods for indoor measurements and radon diagnostic
1999
governmental resolution about radon programme (No. 538, May 1999)
2002
modification of the Atomic Law (No.13/2002)
new Decree of the State Office for Nuclear Safety No. 307/2002 on radiation protection
action level 400 Bq/m3 (radon concentration in air) for existing houses
guidance level 200 Bq/m3 (radon concentration in air) for new buildings
guidance level 1000 Bq/m3 (radon concentration in air) for workplaces
proposal of modification of the uniform method for radon risk classification of foundation soils
2004
new uniform method for radon risk classification of foundation soils, link (pdf)
2005
modification of governmental rules for purchasing and supporting remediation activities
modification of the Decree of the State Office for Nuclear Safety on radiation protection (No. 499/2005)
investigation level 400 Bq/m3 (radon concentration in air) for workplaces
2006
last modification of the Czech National Standard CSN 73 0601 Protection of houses against radon from the soil
2007
uniform
method for performing measurements at workplaces with potential risk of
increased exposures to natural radiation sources and for determination
of effective doses of workers
2009
new governmental resolution about radon programme (No. 594,
May 2009) and the Action plan for the period 2010 - 2019
Czech radon programme today
protective
measures, that should not only reduce exposures to radon in new
buildings (preventive measures), but also in existing dwellings
(interventions; remedial measures)
-
based on the legislation for regulation and control of all potential radon sources (radon from soil, building materials, water)
-
quality
control system - the detailed assessment of radon in soils is an
integral part of building permission, the planning authorities are
responsible for their approvals, all producers and importers of
building materials and all drinking water suppliers are controlled by
inspectors of the State Office for Nuclear Safety
-
surveying the situation - representative survey of radon occurrence in houses in the whole territory of the Czech Republic
-
target survey in dwellings with higher radon concentrations
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improving the radon awareness of the public and all state authorities; informative materials
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assistance to people owing the houses with higher indoor radon levels, offer of a state financial support in special cases
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development of measurement techniques and of protective measures
-
research
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