forz:tion flyizz some of the samples should be almost identical, so that wae actual spread in the data may not be a true index of the ranc—mess of sanpling. By comparison, the excepted samples should affcri an insient into the representativeneas of the others, sADIATION =XPOSURES =.1 Magnitude eee 2. Only zed Flight aircraft approached the planned operational Fail-re to attain the -l-nned exposure in the other flights ig reziected in the lower sample sizes which they obtained. ked Flight expcs.c28 were i= the 3 to 4 roentgen level, White Flight in the 0.5 ' to 1 -centgen level, and Blue Flight in the 0.2 to 0.4 roentgen level. Beca.z2 the aircraft were carefully hand-polished by the F-8hG per- sonne_. the cockrit background was very much lower than expected. The si wh fect ” et experires, total -ediation exposures.were therefore approximately Lot leas than had tein anticipeted. In view of the fact that these aircraft saw radizz.con intensities in excess of 500 rfhr, the low exposures achieved by Fei Flight should be considered a testimony to the skill of its pilots. 2.2 Effectiveness of Shielded Flight Clothing Use c? the shielded flicht clothing by Ked Flight apparently gave zi-ut a four- to five-fold reduction in radiation exposures. The effect iid not arrear to be significant for waite Flight, although for 3lue ZLekt there again appeared to be a significant protection, The eTOte=_cno afforizd to Red Flight apparently corresponds to evidence that 2 ccnsideratie fraction of the radiation flux in the cloud during Red F_=t penetr-tions may be due to the decay of U9 which gives a i i