[1] . Roclie-Farmer L:Trans Am Nucl Soc 35:28,1980.
[2] . Landolt R R et al:Health Phys 44:671, 1983.
[3] . Duncan D L:Int cont on liquid scintillation counting, recent applications and developmant vol. 1:Physical Aspects. P.407 Academic press, INC. New York 1980.