Table 1.

Gamma radiation (γ) dose rate (DR, μSv h⁻¹) and bedrock content (Bq kg⁻¹) of ²³⁸U and ²³²Th in Fen legacy iron mine localities and Søve Niobium mine. Type of bedrock is given per measurement site (MS) but also the main one per adit or shaft is given (zone). Fe-Dolomite carbonatite is abbreviated FDC. In Karup shaft, the locality name is marked with number of meters below surface of the measurement point. Control situated in School office in area is indoors and above Holocene clay deposits (HCD). Abbreviations Karup: K, School mine: SM.

Nr	Mine	Type	Zone	MS bedrock	238U (Bq kg−1)	232Th (Bq kg−1)	γ DR (μSv h−1)
1	SM	adit	FDC	FDC	360	1300	1.3
2	SM	adit	transition	redrock	740	2700	2.5
3	Lichtloch	shaft	transition	redrock/FDC	890	2200	2.2
4	Lichtloch	adit	transition	FDC/232Th veins	900	2000	2.1
5	Lichtloch	adit	redrock	redrock	1100	5400	4.9
6	Lichtloch	adit	redrock	redrock iron ore	1200	11 000	9.1
7	Bolla	shaft	redrock	redrock iron ore	1500	11 000	9.9
8	AnneCat	adita	transition	FDC/some redrock	1500	2200	2.6
9	AnneCat	adit	transition	redrock	680	3500	3.1
10	Western	adit	transition	redrock/FDC	780	3700	3.3
11	K-40 m	shaft	redrock	redrock iron ore	1100	9200	7.9
12	K-26 m	shaft	redrock	redrock iron ore	1600	11 000	9.4
13	K-17 m	shaft	redrock	redrock iron ore	1400	8800	7.8
14	K-6 m	shaft	redrock	redrock iron ore	800	4900	4.3
16	Main adit	aditb	redrock	redrock	1800	9000	8.1
17	Main adit	adit	redrock	redrock	1900	11 000	9.4
18	Hov	adit	redrock	redrock	940	8400	7.2
19	Bolla	adit	redrock	Redrock/FDC	1900	12 000	11
20	Søve	adit	søvite	fenite/some søvite	330	300	0.49
15	Control	Office		HCD	34	28	0.06

^aAt base of shaft.

^bInclined adit.