Evaluation of airborne radiation survey used for monitoring leakage of radionuclides in nuclear accident

Airborne radiation survey is the only effective technology when nuclear accident has happened, and rapid survey of the contaminated areas is needed. In this article, available instruments used in China and all over the world, and the instrument best suit for this task were analyzed. Based on the analysis, minimum detectable activities (MDAs) of ¹³⁷Cs and ¹³¹I measured by GRS-16 in China were calculated according to the results obtained by accumulative calibration of small sources. Furthermore, MDAs of more advanced airborne radiation survey instrument were calculated according to the relative article and Monte Carlo simulation. At last, differences between various instruments were analyzed. (authors)