## Nuclear Toolkit Pro Export any calculation as a dated PDF containing the inputs, assumptions, results, and data-source citations, with space for a signature. It is a report you can file—not just a screenshot. Exported reports are also saved in history on your device, so you can show exactly what was calculated and which assumptions were applied. **$2.99/month or $14.99/year.** If you’ve already supported the app, Pro is included—thank you. ## Everything else remains free All eleven calculators, 3,383 nuclides, 661 metastable isomers, gamma-emission lines, neutron cross sections for 291 isotopes, photon attenuation data, saved scenarios, and image export. Still offline. No account. No ads. Your inputs are never collected. ## Fixes * Fixed an issue where the app could stop responding to taps after opening a nuclide and switching tabs quickly. An invisible overlay could be left behind. * Made pinch-to-zoom on the Chart of Nuclides smoother. The axis rulers now track the grid throughout the gesture instead of snapping into place at the end. * Updated the information and atom icons so they match the tab bar’s text styling instead of rendering as full-colour emoji.

> **PDF calculation reports** > > Any calculation can now be exported as a dated PDF carrying its inputs, the > assumptions applied, the results, and the data-source citations — with space > for a signature. Available in the Dose, Decay, Decay Chain, MDA, Activation, > Shielding, Mixture and Xenon calculators. > > Exported reports are kept in a history on your device, so you can show later > what was calculated and what it assumed, and re-export any of them. Nothing is > uploaded. > > **Saved scenarios** > > Every calculator now remembers named setups — a source and geometry, a > detector configuration, an irradiation. They persist between sessions. > > **Clearer isomer data** > > Metastable isomers now label their excitation energy as a level energy and > show the principal emitted gamma beside it. These are different quantities: > Ag-110m sits at a 117.6 keV level but emits a 657.8 keV photon, and the > emitted energy is the one that matters for detection and shielding. > > **Chart of Nuclides** > > The zoom readout now follows the actual zoom and reads "Fit" for the opening > view. Mass numbers appear when zooming by wheel or pinch. Axis rulers stay > locked to the chart during a pinch instead of snapping at the end. Phones open > at a legible scale rather than fitting all 179 × 118 cells into a smear. > > **Also** > > Exported files are now named readably, e.g. > `gamma-dose-rate-assessment-2026-09-17-14-30.pdf`. > > Every calculator and dataset in the app remains free.

> **Metastable isomers** > > All 661 metastable isomers are now in the app, sourced from the IAEA Live > Chart of Nuclides (ENSDF evaluated levels) — the same provenance as the > 3,383 ground states already there. > > • Selectable in the Decay and Decay Chain calculators, so Tc-99m, Ba-137m, > In-113m, Ag-110m and Am-242m can finally be used directly > • Each has its own decay chain. A pure-IT isomer like Tc-99m sits one step in > front of its ground state (Tc-99m → Tc-99 → Ru-99); a branching one like > Ag-110m keeps both paths and their reconvergence > • Tap any nuclide in the chart to see its isomers, their excitation energies, > half-lives and decay branches > > **Neutron cross sections** > > Thermal (2200 m/s) cross sections and resonance integrals now appear on the > nuclide detail sheet, covering 40 isotopes — the common activation targets > plus the absorbers, reactor poisons and fissile nuclides. > > Coverage is partial and the app says so rather than implying otherwise. There > is no freely available machine-readable source spanning the whole chart, and > every value carries its citation. > > **Also in this release** > > • Chart of Nuclides axis rulers stay accurate at every zoom level > • Assorted layout and typography fixes > > Every feature in the app remains free, offline and account-free.

Enabled payment for the Support Development section and made several minor improvements to the UI. You can find The Support Development from the tab on the very bottom-right. It is together with the Feedback button. Not hard to find in less than 5 mins.