Issues

• xray_sld accepts negative and non-finite material density

  python-periodictable/periodictable#154 · Filter by author swf1996120 opened on Oct 29, 2026

• X-ray conversion accepts nonphysical energy and wavelength values

  python-periodictable/periodictable#152 · Filter by author swf1996120 opened on Oct 29, 2026

• Formula.mass_fraction raises ZeroDivisionError for zero-count formulas

  python-periodictable/periodictable#150 · Filter by author swf1996120 opened on Oct 29, 2026

• Mixture helpers silently ignore negative quantities

  python-periodictable/periodictable#148 · Filter by author swf1996120 opened on Oct 29, 2026

• Formula.replace accepts invalid substitution proportions

  python-periodictable/periodictable#146 · Filter by author swf1996120 opened on Oct 29, 2026

• Formula parser accepts incomplete density annotation as density 1

  python-periodictable/periodictable#144 · Filter by author swf1996120 opened on Oct 29, 2026

• Consider using Hx for exchangeable hydrogen

  python-periodictable/periodictable#141 · Filter by author pkienzle opened on Oct 21, 2026

• 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