Til 50} 137.5 — 137.5 > 87. ae 37.5al © COUNTS / MINUTE (RELATIVE) Ol > hm CALCULATED BACKGROUND © arAke Yo oO LS81a0s ° 1lOr °0 Oo lOO 200 Jo 500 300 _ | 400 | 600 2 (om?) 491 Rev.DC |“Fig. eTeR:Stevenson and Authors: ! | a P.C. H.C. Hicks
Til 50} 137.5 — 137.5 > 87. ae 37.5al © COUNTS / MINUTE (RELATIVE) Ol > hm CALCULATED BACKGROUND © arAke Yo oO LS81a0s ° 1lOr °0 Oo lOO 200 Jo 500 300 _ | 400 | 600 2 (om?) 491 Rev.DC |“Fig. eTeR:Stevenson and Authors: ! | a P.C. H.C. Hicks