#p135: Tb154m2 half-life from 427 keV using foil 3. Beckie quotes chi^2/dof = 0.4
#16 data points. Time since irrad (s) vs ln(A_e)
#Chisqw/D.O.F. = 0.285108, (weighted by 1.0/dy^2), fitting mode: 7
  4294.000      7.601      0.14
 15644.000      7.505      0.12
 56442.000      7.054      0.13
 64417.000      6.928      0.15
 85890.000      6.728      0.12
 90798.000      6.685      0.12
102454.000      6.614      0.11
154294.000      6.224      0.10
170552.000      6.038      0.11
189571.000      5.952      0.11
192945.000      5.891      0.11
200613.000      5.902      0.10
228528.000      5.576      0.11
240184.000      5.497      0.12
317485.000      4.936      0.11
391718.000      4.206      0.14
& #lsf fit: y = 7.518800 - 8.3905e-06*x
0.0000	        7.5188     0.00
518098.1595	 3.1717    0.00