103 This was done in this laboratory by oslculating the millirem output of the neutrons that is to say, eslculating the number of millireps, the number of neutrons required to produce a millirep and then using the Tissue Equivalent Chamber with a atanderd radium source encapsulated in a half a milli-~meter of platinum, The unaccounted dose rate was attributed to the gamma dose rate of the source. All our measurements are reported with the lonizetion ehamber in terms of the polonium beryllium equivslent flux, This flux is not necessarily the same as the flux, the actual fiux in the region, It would rerély be the soase except under rare conditions among which would be the case of the stray radiation, energy spectrum which was the same ag that of polonium berylliuns, However, the ratio of a flux to a permissible flux at a given energy is * strictly proportional to the dose rate, Under ordinary use, we uce the Graphite and the BFs Chambers to evaluate the neutron and gamma dose rates, These are converted to millirem per hour and then