  The SHIELD-HIT transport code, in several versions, has been used for
modeling the interaction of therapeutic beams of light nuclei with
tissue-equivalent materials for a long time. All versions of the code include
useful option of decomposition of the absorbed dose by the linear energy
transfer (LET), but this option has not been described and published so far. In
this work the procedure of decomposition of the absorbed dose by LET is
described and illustrated by using the decomposition of the Bragg curve in
water phantom, irradiated by beams of protons, alpha particles, and of ions
lithium, carbon and oxygen.
