diff --git a/activation/index.html b/activation/index.html
index 0a1bfea..bdedc8c 100644
--- a/activation/index.html
+++ b/activation/index.html
@@ -1031,6 +1031,7 @@ Thermal flux
handbook (IAEA 1987), and the
scattering calculator uses the IUPAC 2021 atomic weights and isotope composition
database (CIAAW 2021).
+ Half-life values come from NUBASE2020 (Kondev 2021).
For very high fluences, e.g., more than 1016 n/cm2, the activation
@@ -1392,21 +1393,34 @@
References
Williams & Wilkins, Baltimore.
[activation data]
+
+ Kondev, F.G.; Wang, M.; Huang, W.J.; Naimi, S. and Audi, G. (2021).
+ The NUBASE2020 evaluation of nuclear physics properties.
+ Chin. Phys. C45, 030001.
+ doi:10.1088/1674-1137/abddae
+ [half-life data]
+
History
+ - 2026-02-27 v2.2.0
+ - Use half-life from NUBASE2020. The following isomers change by 20% or more:
+ 32Si 38Clm 41Ca 79Se 97Tc 108Ag 121Snm 126Sn 135Cs 157Tb 177Lum
+
Update neutron cross sections for
+ 13C Li 6Li 7Li 141Pr Nd 142-146,148,150Nd 144,147-150,152,154Sm 153Eu 174Yb
+
- 2025-04-23 v2.0.0
- Fix sort by half-life with units of ky, My, Gy.
- 2025-02-28 v2.0.0
- Use standard year as 365 rather than 365.2425 days when reporting decay time.
- 2024-12-03 v2.0.0
- Update mass and abundance tables, and physical constant values
-
neutron cross section updates for H, He, C, O, Zn, Kr, Sn, Xe, Sm, Eu, Ir, Pb, Bi
-
X-ray cross section updates for Pt, Cr, Nb, Y, Er
-
208Pb activation scaled by 0.001 (value was reported in mbarns but added as barns)
+
Update neutron cross section for H, He, C, O, Zn, Kr, Sn, Xe, Sm, Eu, Ir, Pb, Bi
+
Update X-ray cross section for Pt, Cr, Nb, Y, Er
+
Update activation for 208Pb (reference value is in mbarns instead of barns)
- 2024-03-22 v1.7.0
- Mixture formulas allow wt% and vol%.
Formulas allow unicode subscripts such as H₂O.