Nuclear Toolkit

7/10/2026

### Shielding and Activation — Corrected
* **Photon buildup:** Implemented ANSI/ANS-6.4.3 buildup factors for all materials over **15 keV–15 MeV**. Thick-lead shielding was corrected; for example, the calculated dose behind **10 cm of lead for Cs-137** is now approximately **half** the previous value.
* **Fast-flux monitors:** Added **Ni-58, Ti-46, S-32, and Cu-63** monitor reactions for **D–T neutron-generator** spectra.