The International Reactor Dosimetry File (IRDF-90) is a nuclear data library which contains recommended neutron cross section data to be used for reactor neutron dosimetry by foil activation. This is Version 2 of that library released in October 1993. These files are also available via a standard ftp account (ftp.nndc.bnl.gov or WWW-NDS.IAEA.ORG) and the World Wide Web (http://www.nndc.bnl.gov or http://www-nds.iaea.org). DOCUMENT Oct-1993 Documantation as a PostScript file. IRDF90V2.PS DOCUMENT Oct-1993 Documentation as an ASCII file. IRDF90V2.TXT XSECT Oct-1993 Dosimetery cross section data file. IRDF90V2_XSECT.DAT DAMAGE Oct-1993 Damage cross section data file. IRDF90V2_DAMAGE.DAT SPECTRA Oct-1993 Benchmark neutron spectra. IRDF90V2_SPECTRA.DAT