Issues

• Loss of atomic mass precision in v2.x

  python-periodictable/periodictable#135 · Filter by author oliver-s-lee opened on Oct 6, 2026
  2

• Inconsistent ordering/values of x-ray atomic scattering files

  python-periodictable/periodictable#133 · Filter by author mattgebert opened on Sep 29, 2026
  3

• transient products are sometimes missing from equilibrium and decay

  python-periodictable/periodictable#131 · Filter by author pkienzle opened on Jun 8, 2026
  1

• 150Nd activation decay chain incorrectly handled.

  python-periodictable/periodictable#127 · Filter by author pkienzle opened on May 28, 2026
  1

• 152m2-Eu -> 152-Eu -> 152-Gd daughter products not accumulated

  python-periodictable/periodictable#126 · Filter by author pkienzle opened on May 27, 2026
  1

• Scale the mass of a layered sample by sample area for the activation calculator.

  python-periodictable/periodictable#125 · Filter by author pkienzle opened on Mar 6, 2026

• Use evaluated cross sections where no measurements exist

  python-periodictable/periodictable#120 · Filter by author pkienzle opened on Feb 19, 2026

• Add citation column to the nsf table.

  python-periodictable/periodictable#119 · Filter by author pkienzle opened on Feb 18, 2026

• Use uv to install python in github workflows

  python-periodictable/periodictable#118 · Filter by author pkienzle opened on Feb 18, 2026

• Use nan instead of None for missing values

  python-periodictable/periodictable#110 · Filter by author pkienzle opened on Jan 9, 2026

• Include NUBASE2020 spin, decay modes and energy in the isotope data

  python-periodictable/periodictable#108 · Filter by author pkienzle opened on Dec 24, 2025

• Scrap delayed loading infrastructure

  python-periodictable/periodictable#102 · Filter by author pkienzle opened on Mar 14, 2025

• include transuranic xray scattering data

  python-periodictable/periodictable#101 · Filter by author pkienzle opened on Feb 12, 2025

• use importlib to find data files

  python-periodictable/periodictable#100 · Filter by author pkienzle opened on Dec 23, 2024
  1

• Use von Dreele approximation to Lynn & Seeger approximation for resonant elements

  python-periodictable/periodictable#99 · Filter by author pkienzle opened on Dec 20, 2024

• calculate X-ray absorption coefficient

  python-periodictable/periodictable#98 · Filter by author toqduj opened on Dec 10, 2024
  2

• Activations with large fluence are inaccurate.

  python-periodictable/periodictable#94 · Filter by author pkienzle opened on Oct 25, 2024
  1

• Check activation tables for Ni-58

  python-periodictable/periodictable#93 · Filter by author pkienzle opened on Oct 24, 2024

• Allow use of Chantler tables for xsf

  python-periodictable/periodictable#54 · Filter by author pkienzle opened on Apr 3, 2023

• Return the correct neutron cross sections for H₂O and D₂O

  python-periodictable/periodictable#47 · Filter by author pkienzle opened on Feb 2, 2022
  2

• incoherent scattering on rare earths

  python-periodictable/periodictable#40 · Filter by author pkienzle opened on Apr 10, 2021
  1

• support post-translational modifications in FASTA

  python-periodictable/periodictable#37 · Filter by author pkienzle opened on Dec 18, 2020
  2

• Syntax for deuteration, exchange percentage and D2O percentage in solvent

  python-periodictable/periodictable#35 · Filter by author pkienzle opened on Oct 8, 2020
  3

• Improve error messages on formula parser

  python-periodictable/periodictable#34 · Filter by author pkienzle opened on Aug 7, 2020

• Improve or remove transmission calculations

  python-periodictable/periodictable#33 · Filter by author pkienzle opened on Jun 16, 2020