anchor.diff:  ,,,,,,
   "Total",,,1.000000,1.000000,0.083662,
   ,,,,,,
  -"MCNP Form","Mass Fractions",,"Atom Fractions",,"Atom Densities",
  +"MCNP Form","Weight Fractions",,"Atom Fractions",,"Atom Densities",
   "Neutrons",1001,-0.056920,1001,0.499985,1001,0.041830
   ,6000,-0.542646,6000,0.400014,6000,0.033466
   ,17000,-0.400434,17000,0.100001,17000,0.008366
  
positive.code: ,"matname","Cesium Iodide",,,,
  ,"density",4.510000,,,,
  "Comments & references:",,,,,,
  "Density and mass fractions from http://physics.nist.gov/cgi-bin/Star/compos.pl?matno=141.",,,,,,
  0,,,,,,
  0,,,,,,
  "Density and mass fractions from http://physics.nist.gov/cgi-bin/Star/compos.pl?matno=024.",,,,,,
  0,,,,,,
  "The element mass fractions are calculated based on the listed mass fractions of compounds in 19 clays",,,,,,
  "from 8 regions in the world.  Data is from Applied Clay Science, p.461-473 of Vol.4 (1989), p.379-395 of ",,,,,,
  "Vol.5 (1991), p.247-266 and 463-477 of Vol.12 (1998), p.337-366 of Vol.15 (Oct.1999), as well as",,,,,,
  "http://www.springerlink.com/content/u692183538748146/fulltext.pdf and",,,,,,
  
negative.code: "Density = 6.16 g/cm3 and formula from page 235 of Radiation Detection and Measurement by Glenn F. Knoll, ",,,,,,
  "3rd edition, John Wiley & Sons, 2000.",,,,,,
  0,,,,,,
  "Density and weight fractions from http://physics.nist.gov/cgi-bin/Star/compos.pl?matno=141.",,,,,,
  0,,,,,,
  0,,,,,,
  "Density and weight fractions from http://physics.nist.gov/cgi-bin/Star/compos.pl?matno=024.",,,,,,
  0,,,,,,
  "The element weight fractions are calculated based on the listed weight fractions of compounds in 19 clays",,,,,,
  "from 8 regions in the world.  Data is from Applied Clay Science, p.461-473 of Vol.4 (1989), p.379-395 of ",,,,,,
  "Vol.5 (1991), p.247-266 and 463-477 of Vol.12 (1998), p.337-366 of Vol.15 (Oct.1999), as well as",,,,,,
  "http://www.springerlink.com/content/u692183538748146/fulltext.pdf and",,,,,,
  