w =20 EC | ze ° o H TIO w < a 3 Oo > O LO EFFECTIVE POTENTIAL OF PHOTON ENERGY (MEV) 2.0 fo) x 100 Figure B.3 Experimental response of Mark II for rays at 90 degrees incidence. PHOTON ENERGY (EFFECTNE KEV) 87 132 168 222 1200 : 180 165 150 135 120 105 90 60 @-— ANGLE OF INCIDENCE (DEGREES) 45 x» S Figure B.4 Variation in response of Mark II with angle of incidence of radiation. _~ 20 x EL _ _— nt wi Syl os an Oa «3 9Oo LO EFFECTIVE POTENTIAL OF PHOTON ENERGY (MEV) Figure B.5 Plot of data from Table B.4. 85 20 0