Reflection of Neutrons by Human Body

Personnel Neutron Dosimeter for Nuclear Accident

“…where H(E) : DE per unit neutron fluence (mrem/ n/cm 2 ) g} (E) : Sensitivity of the fast detector in the dosimeter, e.g. 0.9X10- 4 tracks/ neutron for Pu-Be source g,\ (E) : Sensitivity of the thermal detector in the dosimeter, i.e. 0.…”

Personnel Neutron Dosimeter for Nuclear Accident

“…7 X 10-3 tracks/neutron. In contrast to the SAKURA emulsion, the KODAK (30~) emulsion has a sensitivity for thermal neutrons of only 4 10 3 times that of the SAKURA emulsion. Such a high sensitivity is however not necessary for dosimeters of two detector-elements, because the detectable DE of the dosimeter is limited by the sensitivity of the fast neutron-element.…”

“…The energy of these a-particles is 1.77 MeV, since the reaction is exothermic with an energy release of 2.78 MeV, the entire energy being shared by the 7 Li and a-particles. Assuming that the compositions of the Ilford and SAKURA emulsions are same, the range of the a-particle in the emulsion is 5~6/J>m. On the other hand, the range of recoil protons varies between 4 and 500/J> depending on the energy of neutrons (0.5~10 MeV). A photomicrograph of (a) a-particle track (X 300) (b) Recoil proton track Photo.…”

“…The DE per unit neutron fluence recommended by ICRP is shown by the dotted line 4 in Fig. 1 The responses of dosimeters given by Eqs.…”