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NaI(Tl)            G-factor    .       EFRD 3300  3" ${\Phi}X3$ " NaI(Tl)  G-factor MCNP        ,           EFRD 3300    G-factor  .  EFRD 3300       HPIC     , 3" ${\Phi}X3$ " NaI(Tl)   EFRD 3300 $7.7{\mu}R/h$     $3{\mu}R/h$   .  HPIC         ,   3" ${\Phi}X3$ " NaI           . 【The energy band and the G-factor method were compared to determine the exposure rate from the measured spectrum using a NaI(Tl) scintillation detector. First, G-factors of a 3" ${\Phi}X3$ " NaI(Tl) detector mounted to a EFRD 3300, which means the environmental radiation monitor, in Korea Atomic Energy Research Institute (KAERI) were calculated for several directions of incident photons through the MCNP modeling, and the optimum G-factor applicable to that monitor was then determined by comparing the results both the energy band method and the G-factor method. The results for these spectrometric determinations were also compared with the dose rate from a HPIC radiation monitor around a EFRD 3300. The measured value at the EFRD 3300 based on a 3" ${\Phi}X3$ " NaI(Tl) detector was $7.7{\mu}R/h$ and its difference was shown about $3{\mu}R/h$ , when compared with the results from a HPIC radiation moditor. Since a HPIC is known to be able to measure cosmic rays with the relatively high energy, the difference between them was caused by cosmic rays which were not detected in a 3" ${\Phi}X3$ " NaI(Tl) detector.】

Determinations of the Exposure Rate Using a NaI(Tl) Detector of the Environmental Radiation Monitor