programme in the Czech Republic has a relatively long and rich history.
Procedures, which enable to evaluate the risk of radon penetration from the
ground, to protect new buildings, to find existing buildings with elevated
indoor radon levels and to realize remedial measures in such buildings, have
been developed, published and tested.
majority of cases, the whole system brings good results and leads to a decrease
of indoor radon concentrations. But sometimes it may fail, or it may bring a
poor effect only due to human errors, or due to other psychological, or
Example A: Human behavior affecting measurement
radon concentration significantly changes in time and it may be strongly
influenced by inhabitant’s behavior.
methods are mostly used for indoor radon concentration measurements. Moreover,
integral detectors are located and collected by non-specialists very often.
these reasons, the measurement of indoor radon concentration may be affected by
the owner of the house, or by people who live in the house: knowingly, or
unknowingly. A wide spectrum of cases is observed in practice:
unsuitable location of integral detectors - integral detectors located in rooms
that are declared as habitable rooms (for example as living rooms), but that
are used for other purposes (as storerooms);
- extraordinary conditions during the exposure of integral detectors, for example
a long-term reconstruction of floors in the house
measurement was influenced unknowingly;
want „to avoid any problems“ and they increase the ventilation of rooms, where
the detectors are located;
want to get financial support from the government for a realization of remedial
measures in the house and they reduce the ventilation;
like „experiments“ and they place several detectors together in the same room
to check if the laboratory works well, or not;
want „to safe money“ and they switch-off the sub-slab ventilation system.
measurement was influenced knowingly.
above mentioned problems may appear in different part of the process: during
the search for existing houses with elevated indoor radon levels as well as
during the testing of the effectiveness of remedial measures.
the information on the fact that the measurement has been affected is almost
always lost. The only way how to get such information is to return to the
house, to make a detailed investigation and to speak to people.
Example B: Conflict between individual and
„all-society“ points of view
programme is directed by central (national, state, governmental) institutions
with the goal to decrease a collective dose. But the real target of any action
is always an individual.
individual cases, a detriment connected with radon measurement and with
realization of remedial measures (stress, discomfort) may be greater than a
positive effect connected with lower indoor radon concentrations. This can be
sometimes observed when old people live in an old building.