SHIELDING CALCULATIONS FOR 230-MEV PROTONS USING THE LAHET CODE SYSTEM

Shielding related calculations were performed for 230-MeV protons inci dent upon a stopping-length iron target using the LAHET code system (L CS). Secondary neutrons and photons, produced by proton interactions w ith the target nuclei, were transported through a spherical concrete s hield in which absorbed dose and dose equivalent tallies were produced and attenuation parameters deduced. Comparing calculated results with measurements performed with a similar target, beam, and shielding geo metry, the dose equivalent production term is double the measured valu e. The LCS overestimates measured attenuation values at 0, 22, and 45 deg while correctly predicting the attenuation length al 90 deg. Compa risons of LCS results with HETC calculations and analytical methods in dicates that LCS better estimates the attenuation length and dose equi valent production.