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The Decay Data Evaluation Project at LNHB — critically evaluated, recommended decay data (half-lives, emission energies and intensities) for 200+ radionuclides. The gold standard when you need one number to trust.

NNDC's interactive front end to the ENSDF nuclear structure and decay databases. Levels, gammas, branching, and decay radiation for every nuclide — searchable and plottable in the browser.

The TALYS-based Evaluated Nuclear Data Library — reaction cross sections and residual-production data for essentially every target nuclide. What the cyclotron calculator's co-production tables are built on.

Photon cross sections and total attenuation coefficients for any element, compound, or mixture from 1 keV to 100 GeV. The reference the dose calculator's attenuation tables are built from.

Hubbell & Seltzer's tabulated μ/ρ and μ_en/ρ for the elements and 48 materials of radiological interest — the classic shielding and kerma workhorse.

Stopping powers and CSDA ranges for electrons, protons, and helium ions (ICRU 37 / 49). The charged-particle counterpart to XCOM — and a close cousin of the proton stopping-power tables the cyclotron engine uses.

The SNMMI MIRD Committee's home for MIRDcalc and friends — free, vetted organ-level radiopharmaceutical dosimetry on the ICRP 107 / reference-phantom schema. Rigorous and genuinely usable.

An open, collaborative Monte Carlo database of SAFs and S values for 1,252 radionuclides, plus open-source dosimetry software. Community science done right.

The RAdiation Dose Assessment Resource — the SNMMI committee's freely downloadable compendia of decay data, dose factors, phantoms, and methods. A foundational data source behind clinical dosimetry.

An internal dosimetry program for diagnostic nuclear medicine built on the ICRP reference voxel phantoms — now the official ICRP tool for effective dose. Free for research.

Michael Ljungberg's Monte Carlo code for SPECT (and more) out of Lund University — decades of development, endlessly adaptable, and free for research. A staple of imaging-physics simulation.

The OpenGATE collaboration's Geant4-based Monte Carlo platform for PET, SPECT, CT, radiotherapy, and dosimetry. Scriptable, thoroughly validated, and the community standard for imaging simulation.

An open-source, GPU-accelerated Python library for quantitative SPECT/PET image reconstruction — modular system modeling and modern algorithms built on PyTorch. A genuinely exciting new platform.

Software for Tomographic Image Reconstruction — the long-established open-source C++ framework for iterative PET/SPECT reconstruction, with scatter, randoms, and normalization corrections built in.

The "batteries-included" distribution of ImageJ — thousands of plugins for scientific image processing and analysis, open source and endlessly extensible. The universal workbench for pixels.

The SNMMI Phantom Analysis Toolkit — a free (member) cloud service for automated, reproducible analysis of the common PET/CT QC phantoms. Developed with the University of Iowa CTN scanner-validation effort.

The Cancer Imaging Archive — a large public archive of de-identified cancer imaging (PET/CT, MRI, and more) under open licenses, including the AutoPET FDG collections. A go-to for real datasets.