#p139: Tb154m1 half-life from 540 keV using foil 3. Beckie quotes chi^2/dof = 0.1
#15 data points. Time since irrad (s) vs ln(A_e)
#Chisqw/D.O.F. = 0.077113, (weighted by 1.0/dy^2), fitting mode: 7
  4388.000     10.730      0.200
 15251.000     10.518      0.190
 56416.000      9.704      0.190
 64612.000      9.518      0.190
 85961.000      8.926      0.200
 91105.000      8.889      0.200
102348.000      8.714      0.190
154567.000      7.667      0.190
170577.000      7.280      0.190
189443.000      6.952      0.190
193255.000      6.878      0.190
200497.000      6.730      0.190
229082.000      6.222      0.190
240712.000      5.841      0.200
317514.000      4.376      0.200
& #lsf fit: y = 10.799011 - 2.03368e-05*x
5.4710	        10.7989     0.00
319229.7448	4.3069      0.00