1. Borexino Collaboration, A large scale low background liquid scintillation detector: the counting test facility at gran sasso; Nucl. Instr. and Meth. A 406 (1998) 411.
2. Borexino Collaboration, Light propagation in large scale liquid scintillators, in preparation.
3. A.L. Hines, T.K. Ghosh, S.K. Loyalka, R.C. Warder, Indoor Air Quality and Control, PTR Prentice-Hall, Englewood Cliffs, NJ, 1993.
4. H.F. Lucas Jr., The low-level gamma counting room: radon removal and control, Rep. No. ANL-6938, Argonne National Laboratory, Argonne, IL, 1964.