Nuclear Toolkit

Nuclear Toolkit is a reference and calculation suite for nuclear engineers, health physicists, reactor operators, radiochemists, and students. Every dataset and formula is drawn from authoritative sources and cited in-app, so you can trust the numbers and check the reference. INTERACTIVE CHART OF NUCLIDES • Explore all 3,383 nuclides from the IAEA Live Chart of Nuclides (NUBASE2020 / AME2020). • Smooth pan-and-zoom canvas with decay-mode coloring. • Filter by decay mode and half-life; search any isotope. • Tap any nuclide for half-life, all decay branches with branching ratios, spin-parity, natural abundance, and a scrollable decay chain. DECAY CALCULATOR • Simple decay: A(t) = A₀·e^(−λt) with a dataset or custom half-life. • Decay chains: full Bateman-equation solutions integrated across the chain, with a log-scale activity-vs-time chart and an activities-at-time table. • Mixture activity: specific activity by component mass. • Activity units: Bq, kBq, MBq, GBq, mCi, Ci. • Export results as CSV or share the chart as an image. REACTOR PHYSICS • Xe-135 poisoning simulator: solves coupled I-135 / Xe-135 equations for shutdown (iodine pit), startup, step-down, and custom scenarios. • Six-factor formula: k_eff = η·ε·p·f·P_NL with interactive sliders. • Point kinetics: prompt-jump approximation, stable reactor period, and reactivity in dollars. CONVERTERS & MIXTURES • Unit converters: activity, absorbed dose (Gy/rad), dose equivalent (Sv/rem), dose rate, energy, and exposure. • ICRP 103 radiation- and tissue-weighting-factor reference. • Mixture calculator: convert between atomic and weight fractions and compute mixture density. ACCURATE AND CITABLE • Nuclide data: IAEA Live Chart of Nuclides (© International Atomic Energy Agency). • Element densities: PubChem (NCBI/NIH). • Formulas cited to canonical texts: Lamarsh "Introduction to Nuclear Engineering" and Duderstadt & Hamilton "Nuclear Reactor Analysis," with section numbers on each screen. PRIVATE BY DESIGN • No account, no sign-in, no ads. • Works fully offline once installed. • Optional anonymous usage analytics only; values you enter into calculators are never collected. See the in-app Privacy Policy for details. Nuclear Toolkit is an educational and professional reference tool. It is not a substitute for official procedures, licensed software, or qualified judgment in safety-critical work.