Experimental setup consisted of Hamamatsu R3292 5-
inch diameter round position sensitive PMT (PSPMT) coupled
0.5 mm thick Bicron BC400 plastic scintillator. Optical grease
was used to increase optical contact, see Fig. 1.
In order to use the detector in well-lit environment, which
is a requirement for plant studies, 15 microns Mylar film and
25 micron Tedlar film were applied on top of the scintillating
plastic.