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Version History
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* v0.2   - 2025 / 07 / 19

  Corrected buildup factor extrapolation
  
  Added spherical sources and shield shells
* v0.1   - 2023 / 02 / 12

  Completed benchmarking and corrected cylindrical quadrature
* v0.0.2 - 2022 / 07 / 22
* v0.0.1 - 2019 / 08 / 29