Present Status and Future Perspectives of the NEXT Experiment

Table 3

Activity (in mBq/kg) of the most relevant materials used in NEXT.

Material	Subsystem	^238U	^232Th	Reference
Lead	Shielding	0.37	0.07	[35]
Copper	Inner copper shielding	<0.012	<0.004	[35]
Steel (316Ti)	Vessel	<0.57	<0.54	[35]
Polyethylene	Field cage	0.23	<0.14	[36]
PMT (R11410-MOD, per piece)	Energy plane	<2.5	<2.5	[36]