Correlation Detection

The time resolution of the alpha and gamma correlated detection in FNAP is limited to about 1 ns. This results in a spatial depth resolution for the inelastic reaction of about 5 cm. The edge smearing from the deuteron spot size and neutron scattering within the bag similarly Hmit the resolution in the x and y directions. Thus, this approach typically has used a detection voxel of cm x 5 cm x 5 cm. 

An argument in favour of the correctness of the values of R calculated with the help of eqn. (26) is a correlation detected in ref. 28 between the values of R found in liquid solutions and the values of Rtatt 10 1 s found in solid solutions for the same acceptors (Fig. 25). Such a correlation must exist if the mechanism of electron transfer in either case is tunneling. The lower values of R, as compared with those of Rt, for the reactions of eaq and e(j with the same acceptor are accounted for in a natural way in terms of the tunneling mechanism by the difference of the characteristic times during which there occurs a tunneling. In liquids the characteristic time is the time of a diffusion jump at T = 300 K, 10 10 s, in solids, it is the time between the end of irradiation and the measurement of the radiation yield of et r, t 103s. 

In characterizing hypnograms using the nonlinear mixed effects modeling approach, it is important to test for correlations between r values of one transition model and those from another model using individual estimates of r values. Correlations detected should be accounted for in the model. Correlations with correlation coefficient (r) > 0.75 are termed high correlations and correlations with r values between 0.5 and 0.75 are moderate correlations (25). Not accounting for such correlations may yield parameter estimates with poor precision. 

Relatively few smdies have been published which directly correlate detected levels of PFCs in foods to the migration of these compoimds from food packaging. Interestingly, the Canadian composite food survey (Tittlemier et al. 2006) detected PFOSAs in all foods sampled prior to 2003 with the highest concentration in fast... 

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