. Author manuscript; available in PMC: 2021 Oct 1.

Published in final edited form as: Am J Ind Med. 2020 Aug 9;63(10):859–867. doi: 10.1002/ajim.23167

Table 4.

Average radon concentration (or PAEC) for Příbram mines (Bytiz) -a pilot study calculations

	Radon concentration (pCi/liter or WL)					Official value

Year	Mean	S.D.	Range	CV%	N	Mean	N
1957	746.2^a	696.8	36–2730	93.4	60	261	267
1958	461.7 ^a	534.4	4–5351	115.8	3138	488	794
1959	236.6 ^a	318.0	1.0–4110	134.4	3014	222	882
1960	288.7 ^a	348.3	1.0–3300	120.6	644	373	799
1965	276.4 ^a	411.3	0.0–4480	148.8	869	223	2893
1970	0.54^b	1.22	0.01–13.9	226.2	2000	0.31	2000
1975	0.15 ^b	0.38	0.0–15.4	255.3	2078	0.14	4065
1980	0.11 ^b	0.14	0.01–1.1	123.3	2084	0.09	4172
1985	0.13 ^b	0.23	0.0–5.7	186.1	4445	0.10	4729

- pCi/liter.

- working level (WL).