Figure 11.

Decay in the RIS signal in a single nail (8.9 mg) exposed to a humidity of 72% following a 1,000 Gy dose of x-ray radiation. The points represent the double integrals of the central singlet of the spectra taken at time points from 10 – 300 min post-irradiation. The number of spins in each time point spectrum was determined in reference to a CuCl₂•2H₂O standard. The data for the total spectrum (square) was fit to a two-phase exponential decay model. The r² value for this particular fit was 0.987. For each time point, spectral deconvolutions were conducted to extract the singlet and doublet signals. These data are plotted for the singlet (circle) and doublet (triangle) in the figure and fit to a one-phase exponential model.