▁is ▁that ▁some ▁secondary ▁radiation ▁from ▁interaction ▁of ▁cos mic ▁ray s ▁and ▁space craft ▁materials ▁is ▁high ▁energy ▁sp all ation ▁neut rons . ▁Such ▁neut rons ▁can ▁be ▁moder ated ▁by ▁materials ▁high ▁in ▁light ▁elements , ▁such ▁as ▁poly eth yl ene , ▁but ▁the ▁moder ated ▁neut rons ▁continue ▁to ▁be ▁a ▁radiation ▁ha z ard ▁unless ▁act ively ▁absor bed ▁in ▁the ▁shield ing . ▁Among ▁light ▁elements ▁that ▁abs orb ▁thermal ▁neut rons , ▁ 6 Li ▁and ▁ 1 0 B ▁appear ▁as ▁potential ▁space craft ▁struct ural ▁materials ▁which ▁serve ▁both ▁for ▁mechanical ▁rein for cement ▁and ▁radiation ▁protection . ▁ ▁De ple ted ▁bor on ▁( bor on - 1 1 ) ▁ ▁Rad iation - hard ened ▁sem icon duct ors ▁ ▁Cos mic ▁radiation ▁will ▁produce ▁secondary ▁neut rons ▁if ▁it ▁hits ▁space craft ▁structures . ▁Those ▁neut rons ▁will ▁be ▁captured ▁in ▁ 1 0 B , ▁if ▁it ▁is ▁present ▁in ▁the ▁space craft ' s ▁sem icon duct ors , ▁producing ▁a ▁g amma ▁ray , ▁an ▁alpha ▁particle , ▁and ▁a ▁l ith ium ▁ion . ▁Those ▁result ant ▁decay ▁products ▁may ▁then ▁ir rad iate ▁nearby ▁sem icon duct or ▁" ch ip " ▁structures , ▁causing ▁data ▁loss ▁( bit ▁f li pping , ▁or ▁single ▁event ▁ups et ). ▁In ▁radiation - hard ened ▁sem icon duct or ▁designs , ▁one ▁counter measure ▁is ▁to ▁use ▁de ple ted ▁bor on , ▁which ▁is ▁greatly