PHITS user's manual and lecture notes
User's Manual
The latest version is 3.35

[ 3.35 ] 2025/04/16

(Old versions)
[ 3.34 ] 2024/04/19
[ 3.31 ] 2023/04/19
[ 3.27 ] 2022/03/31
[ 3.24 ] 2021/03/26
[ 3.20 ] 2020/04/09
[ 3.17 ] 2019/10/31
[ 3.10 ] 2019/04/09
[ 3.02 ] 2017/12/05
[ 2.88 ] 2016/09/30
[ 2.82 ] 2015/12/24
[ 2.76 ] 2015/03/20
[ 2.64 ] 2014/02/19
[ 2.52 ] 2013/03/05
[ 2.30a ] 2011/12/02
[ 2.30 ] 2011/08/18
[ 2.23 ] 2010/10/04
Lecture notes  [YouTube tutorial videos are available (Playlist here)]
Each file
Download zip file (including sample input files)
Operation environment
Recommended PC environment
OS: Windows (10 or higher), Mac (macOS 10.13 or higher), or Linux
System memory: 4 GB or larger
Hard disk: 11 GB or larger

Required Software
7zip is required to extract the compressed PHITS contents (phits.7z). Ghostscript and SumatraPDF(only for Windows) are required to see PHITS graphical output file in eps format. PHITS-Pad or other text editors such as Notepad++ and Terapad are required to edit PHITS input file. These software are included in the PHITS installation package. If you want to obtain their latest version, please visit the link below.

File archiver: 7-zip
Text editor for Windows: Notepad++
EPS interpreter: Ghostscript
EPS viewer: SumatraPDF

About compiling
PHITS is a Fortran program for particle transport simulation based on Monte Carlo method. We prepared installer of PHITS, so you do not have to compile PHITS by yourself. On the other hand, re-compile of PHITS is required to extend memory used in PHITS calculations and define your own source using the usrsors.f file. Fortran compiler is required to compile PHITS.

Recommended compiler
Recommended Fortran compilers are Intel Fortran 11.1 (or later).
OneAPI Intel Fortran Complier is freely available. For instlation of the complier and the compilation of PHITS, please see details.