Data sources and evaluation methodology

Gamma rays emitted by radioactive decay from isomers and activation products were observed simultaneously with the prompt gamma rays and have been included in this evaluation. Decay data were taken from the relevant ENSDF data sets and renormalized using the total cross-sections from Mughabghab et al., other literature or the Budapest experimental data (only used when corrections for bombardment time were negligible). These data must be corrected for decay and saturation as described in Chapter 7. Several naturally abundant isotopes emit gamma rays that can be used for quantitative analysis. Data are included for 40K (half-life: 1.265 x 109 a), 50V (1.4 x 1014 a), 138La (1.05 x 1011 a), 176Lu (4.00 x 1010 a), 232Th (1.405 x 1010 a) and 235U (7.038 x 108 a). These gamma ray intensities are provided in units of disintegrations per second per gram of the element