Table 2.

²²²Rn and ²²⁰Rn activity concentrations in air measured with alpha track detectors in Fen legacy iron mines and in Søve Niobium mine with inhalation dose rate contributions (cDR) and combined cold season dose rate (ccDR) with gamma radiation. Abbreviations for bedrock: Fe-Dolomite carbonatite: FDC, Karup: K, redrock: R, redrock with iron: RI, transition zone: T, School mine: SM and søvite: S. Meters below surface given for Karup shaft localities. Control in School office in area covered by Holocene clay deposits (HCD).

Nr	Mine	Type	Zone	222Rn (Bq m−3)	220Rn (Bq m−3)	222Rn cDR (μSv h−1)	220Rn cDR (μSv h−1)	ccDR (μSv h−1)
1	SM	adit	FDC	1500	2400	5.0	3.8	10
2	SM	adit	T	960	3100	3.1	4.9	11
3	Lichtloch	shaft	T	1200	2500	3.7	4.1	10
4	Lichtloch	adit	T	<690	6600	2.2	11	15
5	Lichtloch	adit	R	1600	4700	5.2	7.5	18
6	Lichtloch	adit	RI	800	4100	2.6	6.6	18
7	Bolla	shaft	RI	880	45 000	2.9	72	85
8	AnneCat	adita	T	1600	740	5.3	1.2	9.1
9	AnneCat	adit	T	560	2600	1.8	4.1	9.1
10	Western	Adit	T	6900	1100	22	1.8	28
11	K-40 m	shaft	RI	1300	1600	4.2	2.6	15
12	K-26 m	shaft	RI	1200	8100	4.0	13	26
13	K-17 m	shaft	RI	<600	2300	1.9	3.8	14
14	K-6 m	shaft	RI	<580	2900	1.9	4.6	11
16	Main adit	aditb	R	1700	5600	5.5	9.0	23
17	Main adit	adit	R	840	6900	2.7	11	23
18	Hov	adit	R	6600	3100	22	5.0	34
19	Bolla	adit	R	2500	3500	8.2	5.6	24
20	Søve	adit	S	5500	2200	18	3.5	22
15	Control	Office	HCD	<540	1900	1.7	3.0	4.8
16	Control	Office	HCD	<11	4700	0.1	7.5	7.6

^aAt base of shaft.

^bInclined adit.