Table 1.

Yearly average mine concentration of ²²²Rn for the Jáchymov region

	222Rn concentration in pCi/l			WL	Measurementsa	Minesb
Year	Mean	S.D.	Range	Estimated	N	N
1924	2982.1	2858.1	291–8954	26.3	12	2
1928	4138.7	3273.5	633–7116	36.6	3	1
1930	2816.7	2077.6	0–7728	24.9	70	3
1932	613.5	504.1	36–1965	3.3	36	3
1933	223.3	213.7	0–659	1.2	15	1
1934	839.4	496.3	36–2293	4.5	33	3
1948	2000			17.7	>308	7
1949	1016.3	607	466–1913	9	1476	7
1950	1058.6	401.7	533–1547	9.4	4113	7
1951	889.6	499.9	248–1336	4.8	453	5
1952	401.5	168	111–629	2.2	308	14
1953	520.3	171.9	326–818	2.8	2750	12
1954	425.9	117.7	233–659	2.3	3639	15
1955	397.3	144.9	215–625	2.1	4331	12
1956	389.6	216.5	104–810	2.1	3539	11
1957	344.3	147.2	71–515	1.9	771	11
1958	188.9	152.9	20–437	1	996	10
1959	402.4	215.4	85–710	2.2	685	9
1960	342.5	248	85–760	1.9	573	8
1961	270	-	-	1.5	-	2
1962	300	-	-	1.6	-	1

^a.Total number of measurements on which the mine means were based.

^b.Number of mine averages on which the presented means are based.

^c.For year 1948 the value from 1950 was assigned