Author:
Mo H.,Gong P.,Liang D.,Wang Z.,Zhang J.,Hu Z.,Wu R.,Tang X.,Wang J.,Ma J.,Yang X.
Abstract
Abstract
During a nuclear emergency, an internal exposure detection
device with on-site and rapid measurements should be developed to
assess the level of internal exposure of people in radioactively
contaminated areas. Based on MCNP simulations, this work designed a
shielding structure of a NaI(Tl) type vehicle-mounted whole-body
counter (VM-WBC) and it has good shielding performance against the
background radiation. The mass of the shielding structure was less
than 800 kg, and the minimum detectable activity (MDA) of 60Co
and 137Cs obtained by simulation for a 10 min measurement was
less than 50 Bq. And we also study its counting efficiency
calibration by simulating radiation computing phantoms with Chinese
and American reference physiological characteristics. Equations that
fit counting efficiency, body build index, and photon energy were
also developed. The relative efficiency deviation between the
equation and the MCNP simulation was less than 5%.
Subject
Mathematical Physics,Instrumentation