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No	Data
1	Germany Case-control study of about 20,000 dwellings. Median radon concentrations are about 14 Bq/m3 outdoors and 40 Bq/m3 in dwellings. One percent of German homes has an indoor radon value more than 250 Bq/m3. High radon concentrations of more than 10,000 Bq/m3 were found in some high radon areas as Saxony and Lower Bavaria. The epidemiological study shows a clear influence of the exposure to radon on lung cancer risk in radon prone matching areas. The odds ration for the liner trend is 1.13 for an increase in exposure of 100 Bq/m3.	K-01
2	Poland The permissible level of radon concentration in new houses is 200 Bq/m3, while in existing houses - 400 Bq/m3.	W-01
3	Brazil Man's exposure to natural radiation accounts for around 70% of the total dose received by the population. Most of this exposure is due to Rn-222, a member of the U-238 decay series, which is produced by the direct decay of Ra-226. Being a noble gas, radon produced in the rock or soil matrix can easily diffuse to the water trapped in the pore spaces and migrate to ground water, where it may be present in concentrations several orders of magnitude higher than those of its predecessor. A survey has been carried out in the metropolitan area of Recife, Brazil. the results of this survey, as far as Rn-222 is concerned: Water samples collected from 97 drilled wells were analyzed showing concentrations ranging from 5.3 to 83.7 Bq/L, with an average concentration of 28.0 Bq/L. The corresponding doses ranged from 0.09 to 2.25 mSv/yr.	S-05
4	Brazil Radon-222 content has been determined in natural waters from 23 fountains located in Poços de Caldas and neighboring cities. The highest concentration was found in Águas da Prata (926 Bq/l), followed by Caldas (418 Bq/l maximum) and Poços de Caldas ( 280 Bq/l maximum).	T-01
5	Belgium Local geology varies substantially from uranium-rich to uranium-poor rocks and solids. Measurements were made in 116 dwellings - large regional variation (15 - 3,300 Bq/m3), with an average of 116 Bq/m3. positive correlation found between radon gas levels in soil and indoor air radon levels was found.	A-08
6	Saudi Arabia A study of Rn-222 levels in Riyadh groundwater was undertaken (34% of city water - ground water). 90 wells were studied and all samples had low radon concentration (average 2.99 Bq/l for deep wells and 3.44 Bq/l for shallow wells). Due to water cooling, radon levels in the treatment plants reduced by 74-96%. Plants' product contains 0.49 Bq/l of Rn-222.	A-09
7	China Radon measurements were done in 40 underground dwellings in Gansu Province. Average was 198 Bq/m3.	W-07
8	Canada Winnipeg - measurements were made in bedrooms and the average result was 118 Bq/m3.	L-09
9	Sweden Three-month winter study of indoor radon concentrations was undertaken in Sweden - average was 107 Bq/m3.	P-10
10	Spain 106 homes in 4 main towns of the central Asturias region were studied and more than 1000 measurements were taken. Annual mean is 23 Bq/m3 (lower than world average of 37 Bq/3). Annual dose equivalent is estimated at 0.62 mSv.	I-04
11	Finland Finland is an area with heavy exposure to radon, especially in the south. The mean level is 200 Bq/m3 and occasionally exceed 10,000 Bq/m3.	R-06
12	Hungary In Hungarian caves average readings are between 3,920 and 6,710 Bq/m3. Estimated doses are: 5.2 mSv/year for tour guides and between 7 and 211 microSv/year for visitors (based on 1hour/year exposure.	S-16
13	Italy A 5-year long nation-wide study, average value was 75 Bq/m3, 8.7% dwellings had levels above 150 Bq/m3, 0.2% - above 600 Bq/m3. Averages ranged between 20 and 120 Bq/m3.	B-08
14	Japan Radon concentrations were measured at Misasa spa in Tottori prefecture, between 1992 and 1995. The values were as follows: indoors 10-200 Bq/m3, outdoors 5-150 Bq/m3, in bathrooms 50-4800 Bq/m3.	I-08
15	Kenya Rn-222 activity concentrations in ground water ranged from 0.8 to 372 Bq/l. Number of supplies contain Rn-222 in excess of the safety levels allowed elsewhere.	O-02
16	Lithuania National-wide average for indoor radon is 55 Bq/m3. There is a radon-prone area in the north of the country where karst phenomena takes place, 400 houses were studied and an average was 125 Bq/m3.	M-11
17	Jordan Average indoor radon concentrations are 27 - 88 Bq/m3. In several regions indoor radon levels are greater than world average by a factor of 2, and in Madaba & Karak - by a factor of more than 3. Large variation in levels may be attributed to the large variation in the Ra-226 activity in soils.	A-10
18	Korea Six Korean cities were studied, mean indoor radon concentrations vary from 16 Bq/m3 in Seoul to 65 Bq/m3 in Kongju.	C-08
19	Japan A nationwide survey was undertaken in 1993-1997, mean value was 15.5 Bq/m3.	S-17
20	Japan Concentrations of radon in water in Kobe area were studied. The following values were detected: drinkable water 40.6 Bq/kg (range 6.5-78.6 Bq/kg), undrinkable ground water - 69-210 Bq/kg, water in springs - 24-1280 Bq/kg. A decrease in Rn-222 concentrations of the ground water was observed for several months before the Kobe earthquake in January 1995. But a remarkable increase in Rn-222 concentrations in the atmosphere was observed at the same station for 2 months before the earthquake --- therefore, radon levels may possibly be used to predict the earthquakes.	Y-01
21	Iran Concentrations of Rn-222 in water survey were studied in 23 provincial centres, minimal average was detected in Sanandaj (7900 Bq/m3), maximum - in Tehran (46500 Bq/m3), overall national mean was 21000 Bq/m3. Mean value for the tap water in Tehran is 3800 Bq/m3.	S-18
22	Spain Study of spas was undertaken. Radon concentrations in water ranged from < 2 to 775000 Bq/m3, in air - from < 10 to 5200 Bq/m3. Estimated doses for workers are from 1 mSv/y for office personnel to 44 mSv/y for bath attendants.	S-19
23	Egypt A study of radon levels in a typical Egyptian village was undertaken and measurements taken in 50 houses. Data obtained was as follows: Concrete buildings: (a) ground floor in summer: closed rooms 37 Bq/m3, open rooms 24 Bq/m3; (b) ground floor in winter: 36 Bq/m3 in closed rooms, 18 Bq/m3 in open rooms; (c) first floor in winter: 15 Bq/m3 in closed rooms, 11 Bq/m3 in open rooms. Clay buildings: (a) ground floor in summer: closed rooms 46 Bq/m3, open rooms 19 Bq/m3; (b) ground floor in winter: 56 Bq/m3 in closed rooms, 40 Bq/m3 in open rooms; (c) first floor in winter: 18 Bq/m3 in closed rooms, 11 Bq/m3 in open rooms.	A-11
24	India Ground waters in coastal Karnataka & Kaiga areas were studied. Concentrations of Rn-222 in open well water were 3.74 Bq/l (range 0.14-25.4 Bq/l), in bore well water - 5.75 Bq/l (range 0.22-197.0 Bq/l). Doses were estimated for open well water consumers (0.09 - 204.2 microSv/year), and for bore well water consumers (0.2 - 1586.9 microSv/yr).	M-12
25	Japan Radon concentrations were studied in Misasa district, Tottori prefecture & Ikeda mineral spring. Misasa spa district: indoor concentrations 24-170 Bq/m3, 6.7-50 Bq/m3 outdoors, and 48-274 Bq/m3 in bathrooms. At Ikeda radium spring district following values were detected: 57-852 Bq/m3 indoors, 22-101 Bq/m3 outdoors, and 261-1135 Bq/m3 in bathrooms. Radon concentrations in private houses are comparatively low: 17-282 Bq/m3 indoors and 12-26 Bq/m3 outdoors.	I-05
26	Korea Annual mean in 6 central Korean cities is 26.1 Bq/m3 indoors and 9.0 Bq/m3 outdoors. In Seoul concentrations in basements (average=43.8 Bq/m3) are clearly higher than in living/working places (average=24.2 Bq/m3).	Z-01
27	Belgium 278 buildings in the region of Brussels were studied. Geometrical mean was 19 Bq/m3. No value higher than 400 Bq/m3 was measured in occupied room. One third of houses without basements or ventilated crawl spaces built on loess show an indoor concentration above 200 Bq/m3.	T-08
28	China Cave dwellings and brick houses in the Yan'an region were studied. Underground dwellings are built into quaternary loess, brick houses founded on it. Concentrations were as follows: cave dwellings: Rn-222 92 Bq/m3, Rn-220 - 215 Bq/m3, houses: Rn-222 - 42 Bq/m3, Rn-220 - 77 Bq/m3. Effective doses were estimated for exposure to Rn-222 and Rn-220 - at 2.7 mSv/yr in a brick houses, 7.1 mSv/year in a cave dwelling, and 16.7 in a traditional cave dwelling with a bed foundation built with loess.	W-08
29	China, Hong Kong Radon measurements were taken in Hong Kong to assess the dose to population from natural radiation sources. Geometric mean was 28 Bq/m3 in residential and 90 Bq/m3 - in non-residential buildings. Mean gamma background is 0.22 microGy/hr. Dose to population is estimated at 2.4+1.3 mSv/yr.	T-09
30	Slovenia Radon concentrations were studied in 890 Slovenian schools - arithmetic mean was 168 Bq/m3, 675 of schools have levels less than 100 Bq/m3, 8.7% - more than 400 Bq/m3. Mean gamma background was 0.102 microGy/hr.	V-04
31	Greece Radon concentrations were studied in the town of Metsovo, in north-western Greece. Indoor ranged from 17.6 to 750.4 Bq/m3, Ra-226 concentration in soil from 4.9 to 97.1 Bq/m3.	I-06
32	Slovenia Concentrations of radon were measured in Postojna cave. Results ranged from 500 Bq/m3 in winter to about 6,000 Bq/m3 in summer. Dose to employees in the cave was estimated at 0.02 - 8.4 mSv/yr.	V-05
33	Greece Measurements of radon in public water supplies of the Migdonia region in northern Greece were carried out. Results ranged from background to 170 Bq/l, and the level of 50 Bq/l was exceeded in 23% of water supplies.	S-22
34	Brazil Thermal spa at Termas de Araxa was studied. In the spring waters used in thermal treatments, dissolved radon concentrations were up to 1,231 Bq/l, in the same waters Ra-226 were in the range 0.049-0.146 Bq/l, and Ra-228 - in the range 0.077-0.269 Bq/l. Bathing mud contains Th-232 (<0.6-1.9 Bq/kg), Ra-226 (<0.2-1.4 Bq/kg), and K-40 (<2.3-11 Bq/kg). Rn-222 concentration indoors at the swimming pool room was measured up to 8,372 bq/m3. Doses for patients could be up to 0.32 mSv/y, for personnel - up to 18 mSv/yr.	D-06
35	UK, underground mining Central Index for Dose Information shows that the "mining underground" category is one with the largest number of doses in excess of 15 mSv/year. These doses arise from exposure to radon and its daughter products. Number of individual doses above 15 mSv/year in this category was 224 in 1986 and 140 in 1994.	C-11

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