Table 3.

Airborne TnP uncorrected with bias (BiasEECTn) and corrected for mine draft airflow bias (CorrEECTn) measured with deposition detectors at some Fen complex mine localities, and compared with measured ²²⁰Rn, the equilibrium factor, F, with the ones most similar to another mine study in bold

Nr	Mine	Type	Bedrock	BiasEECTn (Bq m−3)	CorrEECTn (Bq m−3)	Biased F	Corr F
16	Main adit	adita	R w/I	760	98	0.134	0.017
17	Main adit	adit	R w/I	320	42	0.047	0.006
18	Hov	adit	R w/I	580	76	0.188	0.024
19	Bolla	adit	R, I, FDC	88	11	0.025	0.003
20	Søve	adit	F mix	150	19	0.067	0.009

^aInclined adit.