Table 5.

${}^{222}$Rn emanation measurements of all parts of a QDrive recirculation pump prior to assembly

ID	Sample	Description	${}^{222}$Rn emanation rate
#24	2 stators	Silicon steel frame, Cu wire winding, polyester impregnate	(2.99 ± 0.15) mBq
#25	2 pistons	Made of brass	(0.68 ± 0.06) mBq
#26	2 magnet cores	Each equipped with 8 magnets	(0.28 ± 0.11) mBq
#27	4 flexure assemblies	Silicon steel, stainless steel	(0.132 ± 0.021) mBq
#28	Polyester lacing	To fix Cu wire winding	$<0.053$ mBq
#29	Remaining small items	3 other types of epoxy, screws, nuts, spacers	$<0.020$ mBq