FIGURE 4.

LN σ for 3 different activity concentrations of ²¹⁰Po-citrate. Open squares (□) represent values of σ obtained, when <n> was constrained, by LS fits of experimental track data corresponding to longest decay accumulation times (i.e., t₂ > t₁, Figs. 1C, 2B, and 3B) to LN distribution function. SEs of these fitted σ -values are indicated by vertical lines. Corresponding σ -values obtained for these same data using P-LN distribution function are shown as open circles (○). Open triangles (△) correspond to LS fits of convolved data (Figs. 1D, 2C, and 3C) to LN function. Finally, dashed line passes through what are considered best σ -values as defined by lowest χ̂².