Contents

This is a Python package for the quantitative analysis of the interaction of energetic x-rays with matter. This package is named after one of the discoverers of X-rays, Wilhelm Roentgen. He was awarded the very first Nobel Prize in Physics “in recognition of the extraordinary services he has rendered by the discovery of the remarkable rays subsequently named after him”. X-rays were originally referred to as Roentgen rays.

• Guide
  • Theory of Transmission and Absorption
    • Mass Attenuation Coefficient
    • Transmission and Absorption
    • Multiple Materials
    • Reference
  • Transmission and Absorption of X-rays in matter
    • Mass Attenuation Coefficient
    • Material
    • Stack
  • List of Elements
  • Attenuators
    • RHESSI
  • Comparison with CXRO
  • Emission Lines
  • List of Emission Lines
  • X-ray emission from radionuclides
    • Ba-133 Example Spectrum
  • List of Nuclides
  • Graphical User Interface
• Data Sources
  • elements.csv
  • compounds_mixtures.csv
  • emission_lines.csv
  • emission_energies.csv
  • electron_binding_energies.csv
  • lara
• API Reference
  • roentgen
    • roentgen.absorption
    • roentgen.lines
    • roentgen.nuclides
    • roentgen.tests
    • roentgen.util
  • roentgen.absorption.material
    • MassAttenuationCoefficient
    • Material
    • Response
    • Stack
  • roentgen.lines.lines
    • get_edges()
    • get_lines()
  • roentgen.util.util
    • density_ideal_gas()
    • get_atomic_number()
    • get_compound_index()
    • get_element_symbol()
    • get_material_density()
    • get_material_name()
    • get_material_symbol()
    • is_an_element()
    • is_in_known_compounds()
  • roentgen.nuclides.nuclides
    • Nuclide
    • get_lara_file()
    • get_nuclide_mass_numbers()
    • read_lara_header()
    • read_lara_tables()
• Examples
  • Getting and plotting the Mass Attenuation Coefficient
  • Edges in the Mass Attenuation Coefficient and Interpolation
  • Finding the x-ray absorption of different detector materials
  • Plotting the x-ray spectrum from a particular element
  • Finding all x-ray lines in an energy range
  • Finding the response of an x-ray detector
  • Finding the x-ray transmission through different materials
  • Checking on edges in the Mass Attenuation Coefficient
  • Finding the transmission through a stack of materials
  • Defining your own custom material
  • X-ray Transmission through air at STP
  • Finding X-ray K absorption Edges
  • Ba-133 Source Spectrum
• Contributing
• Developer’s Guide
  • Developer Environment
  • Coding Standards
    • Language Standard
    • Coding Style/Conventions
    • Private code
    • Documentation and Testing
    • Data and Configuration
  • Documentation Rules
    • Overview
    • Sphinx
  • Release Process
• Authors
• License
• Changelog
  • 2.4.0 (2026-Jan)
  • 2.3.0 (2024-10-14)
  • 2.2.0 (2024-03-14)
  • 2.1.0 (2022-01-07)
  • 2.0.1 (2022-10-10)
  • 1.0.0 (2020-04-23)
  • 0.1.0 (2017-03-24)

Indices and tables

• Index

• Module Index

• Search Page