188 ZERO-LEVEL LOCATION, CHANNELS FOOTE 7 ~ 180 ~ 9 ex 18] | 182 | 183 184 185 186 2.615—MEV PHOTOPEAK LOCATION, CHANNELS/ 200 Fig. 5——Lanthanum-140 matrix output error as a function of zero level FRACTION OF AMOUNT PRESENT ON DEC, 22, 1962 and °8Tl photopeak location. Por Po ob TT tt TTT _ T= 65 DAYS TT VT TF ET OT OT 0.05 IN, RAIN 0.24 IN. RAIN 1.0 \ 0.02 IN. RAIN 0.9 PBN 0.7 - A ttt tfTt_T_E?_ EE? ETT?! 18 19 20 2122 23 24 25 26 27 282930311 r | EL 23 LNA EE 45 6 AUGUST ne ET! 7 8 EE _ _ EE ¥ 101112131415 161718 SEPTEMBER TITTIES 0.12 IN. RAIN 0.8 F 0.7 r mn 0.6 0.5 E 0.4 - B ttt | _ a ye eeee — tt 18.19 20 2122 23 24 25 26 2728 29301 23.45 6 7 8 9 101112131415 161718 SEPTEMBER OCTOBER DATE Fig. 6—Zirconium-95—niobium-95 effective function of time, 1963. surface amounts as a 4 =