Sensitivity analysis of a dynamic food chain model DYNACON considering Korean agricultural conditions

The sensitivity analysis of input parameters for a dynamic food chain model DYNACON was performed as a function of deposition time for the long-lived radionuclides (137Cs, 90Sr) and the selected foodstuffs (cereals, milk). The influence of input parameters for short and long-term contaminations of the foodstuffs after a deposition was also investigated. The input parameters were sampled using a Latin hypercube sampling (LHS) technique, and their sensitivity indices were quantified as partial rank correlation coefficient (PRCC). PRCCs were strongly dependent on the contamination period of foodstuffs as well as the deposition time of radionuclides. In case of deposition during growing stage of agricultural plants, the input parameters associated with contamination by foliar absorption were relatively influential in long-term contamination as well as short-term contamination. They were also influential in short-term contamination in case of deposition during non-growing stage. As the contamination period is longer, the influence of parameters associated with contamination by root uptake was increased. This phenomenon was more remarkable in case of the deposition during non-growing stage than growing stage, and in case of 90Sr deposition than 137Cs deposition. In case of deposition during growing stage of pasture, the characteristic parameters of cattle such as feed-milk transfer factor and daily intake rate were relatively influential in the contamination of milk. (author)