6 Chart 3. Logarithmically Transformed Count Rate as a Function of Distance from Source Curve Transformed Distance versus Count Rate Curve 2.40 2.30 2.20 2.10 2.00 1.90 1.80 Transformed Count Rate per half minute (N), log(N) 1.70 1.60 1.50 y = -1.64x + 3.55 1.40 1.30 1.20 1.10 1.00 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 Transformed Distance (r) from Radiation Source (cm), log(r) Calculation of slope to determine proportionality between count rate and distance from source: ?1??e = Alog (N) = -1.64 = -2 Alog (?)