The EGS (Electron Gamma Shower) computer code system is a general purpose package for the Monte Carlo simulation of the coupled transport of electrons and photons in an arbitrary geometry for particles with energies from a few keV up to several hundreds of GeV. It originated at SLAC but National Research Council of Canada and KEK have been involved in its development since the early 80s.
Development of the original EGS code ended with version EGS4. Since then two groups have re-written the code with new physics:
- EGSnrc, maintained by the Ionizing Radiation Standards Group, Measurement Science and Standards, National Research Council of Canada 
- EGS5, maintained by KEK, the Japanese particle physics research facility 
|Developer(s)||National Research Council Canada|
2018 / April 6, 2018
|License||GNU Affero General Public License|
EGSnrc is a general-purpose software toolkit that can be applied to build Monte Carlo simulations of coupled electron-photon transport, for particle energies ranging from 1 keV to 10 GeV. It is widely used internationally in a variety of radiation-related fields. The EGSnrc implementation improves the accuracy and precision of the charged particle transport mechanics and the atomic scattering cross-section data. The charged particle multiple scattering algorithm allows for large step sizes without sacrificing accuracy - a key feature of the toolkit that leads to fast simulation speeds. EGSnrc also includes a C++ class library called egs++ that can be used to model elaborate geometries and particle sources.
EGSnrc is open source and distributed on GitHub under the GNU Affero General Public License. Download EGSnrc for free, submit bug reports, and contribute pull requests on the Github page . The documentation for EGSnrc is also available online .
There is an active google+ community that provides support for users .
EGSnrc is distributed with a wide range of applications that utilize the radiation transport physics to calculate specific quantities. These codes have been developed by numerous authors over the lifetime of EGSnrc to support the large user community. It is possible to calculate quantities such as absorbed dose, kerma, particle fluence, and much more, with complex geometrical conditions. One of the most well-known EGSnrc applications is BEAMnrc, which was developed as part of the OMEGA project. This was a collaboration between the National Research Council of Canada and a research group at the University of Wisconsin–Madison. All types of medical linear accelerators can be modelled using the BEAMnrc's component module system.
- Nelson, W. R.; Hirayama, H.; Rogers, D. W. O. (1985). "The EGS4 Code System". Report SLAC–265, Stanford Linear Accelerator Center, Stanford, California.
- Kawrakow, I (2000). "Accurate condensed history Monte Carlo simulation of electron transport. I. EGSnrc, the new EGS4 version.". Medical Physics. 27 (3): 485–98. Bibcode:2000MedPh..27..485K. doi:10.1118/1.598917.
- Kawrakow, I (2000). "Accurate condensed history Monte Carlo simulation of electron transport. II. Application to ion chamber response simulations: I". Medical Physics. 27 (3): 499–513. Bibcode:2000MedPh..27..499K. doi:10.1118/1.598918.
- Borg, J.; Kawrakow, I.; Rogers, D. W. O.; Seuntjens, J. P. (2000). "Monte Carlo study of Spencer-Attix cavity theory at low photon energies". Medical Physics. 27 (8): 1804–13. Bibcode:2000MedPh..27.1804B. doi:10.1118/1.1287054.
- Kawrakow, I; Bielajew, A. F. (1998). "On the representation of electron multiple elastic-scattering distributions for Monte Carlo calculations". Nuclear Instruments and Methods in Physics Research Section B. 134 (3-4): 325–36. Bibcode:1998NIMPB.134..325K. doi:10.1016/S0168-583X(97)00723-4.
- Kawrakow, I; Bielajew, A. F. (1998). "On the condensed history technique for electron transport". Nuclear Instruments and Methods in Physics Research Section B. 142 (3): 253–80. Bibcode:1998NIMPB.142..253K. doi:10.1016/S0168-583X(98)00274-2.
- Rogers, D. W. O. (1995). "BEAM: A Monte Carlo code to simulate radiotherapy treatment units". Medical Physics. 22 (5): 503. Bibcode:1995MedPh..22..503R. doi:10.1118/1.597552.
- NRC-CNRC page for EGSnrc
- KEK page for EGS5
- EGSnrc Github page
- EGSnrc online documentation
- EGSnrc google+ community
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