The noble gas Radon is a chemical element that has no stable isotopes. Radon isotopes result from the disintegration of 238U, 235U and 232Th. The half-life of 222Rn is 3.8235 days, for 220Rn is 55.6 s and for 219Rn is 3.96 s. Radon is the second cause of lung cancer for the population after smoking, [1, 2]. Medical studies have provided clear evidence of an association between Radon exposure in homes and workplaces and lung cancer, even at relatively low concentrations of Radon. Radon emanates from rocks and soils and accumulates in enclosed spaces such as underground mines, basements or houses. Radon is the most important contributor to the dose of ionizing radiation received by the population. This paper is based on Radon measurements undertaken by different research groups, in several European countries. The concentration of Radon in underground, in caves and mines, takes values from tenth of Bq/m3 up to more than one million Bq/m3.

1.
***, Exposures from natural radiation sources, UNSCEAR 2000, Annex B ().
2.
***,
WHO handbook on indoor radon: a public health perspectiv
(
2009
).
3.
J. L.
Marshall
and
V. R.
Marshall
,
Bull. Hist. Chem.
28
(
2003
).
4.
C.
Papastefanou
,
M.
Manolopoulou
,
S.
Stoulos
,
A.
Ioannidou
,
E.
Gerasopoulos
,
Journal of Radioanalytical and Nuclear Chemistry
258
,
205
208
(
2003
).
5.
L. F.
Lichwa
,
Journal of Radiation Research and Applied Sciences
8
,
334
353
(
2015
).
6.
ICRP
, Lung cancer risk from radon and progeny and statement on radon,
ICRP Publication
115
(
2010
).
7.
B.
Tate
and
S.
Long
,
Acceptance testing of the tasl radon dosimetry system
,
Technical Report
175
(
2016
).
8.
Alphaguard professional radon monitor, User Manual
(
2017
).
9.
L.
Thinova
,
A.
Fronka
and
K.
Rovenska
,
Radiation Protection Dosimetry
164
,
502
509
(
2015
).
10.
S. A. B. X.-G. H. S. K. F. A. S.
Bekteshi
,
S.
Kabashi
and
B.
Abdullahu
,
Journal of Cleaner Production
155
,
198
203
(
2017
).
11.
S. K. B. X.-K. D. G.
Hodolli
,
S.
Bekteshi
,
International Journal of Radiation Research
13
(
2015
).
12.
L. F.
Lichwa
,
Journal of Environmental Radioactivity
165
,
13
23
(
2016
).
13.
A. C. D. B. B. P. S. C. M. M. S. G. N.
Bican-Brisan
,
C.
Cosma
,
Rom. Journ. Phys.
61
,
1040
1050
(
2016
).
14.
B. D. B. O. A. D. C. C. B. P. O. Alexandra Cucos
Dinu
,
Monica I.
Calugar
,
Environ Geochem Health
39
,
1085
1099
(
2017
).
15.
S. C. M. P. E. G. C.
Dueas
,
M.C.
Fernndez
,
Radiation Measurements
46
,
1181
1186
(
2011
).
16.
A. F.-C. S. C. S. S.-M. Miriam
Alvarez-Gallego
,
Elena
Garcia-Anton
,
Journal of Environmental Radioactivity
145
,
19
29
(
2015
).
17.
B. K. Stanka
Sebela
,
Janja
Vaupotic
and
J.
Stemberk
,
Journal of Cave and Karst Studies
72
,
21
34
(
2010
).
18.
A. Z. A.
Gregoric
and
J.
Vaupotic
,
Nat. Hazards Earth Syst. Sci.
11
,
1523
1528
(
2011
).
This content is only available via PDF.