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