101 en — gamma radiation. Yor this reason we introduce the use of BFy and Graphite Chambers, The BF3 Chamber has a six centi~ meter polyethylene moderator, the purpose of moderating the incoming fast neutrons and enhancing the response of this chamber to neutron Badiation; the Graphite Chamber hae a negligible neutron response so that the two of them oan be used for the purpose of measuring the gamma dose rate and the neutron dose rate, ’ fhe relative response of the BF Chamber to neutron radiation is an orier of magnitude greater than that due to the Tissue Equivalent Chember, And so, this improves the reaolution as it were, The response of the Tissue Equie < valent Chamber except for possible variations of the dose delivered in the human body from multiple neutron collisions as opposed to single collision is essentially flat with respect to energy, The flux required to produce a - millirem per hour at 500 KEV may be ten times, or rather three times that required at ten MEV, but nonethelese, the energy