~(60)Coγ辐照对稻谷平衡含水率的影响

将辐照剂量这一因素加入到常用的3组平衡含水率模型中,对不同剂量γ射线辐照稻谷进行平衡含水率的研究,建立受辐照剂量、环境相对湿度和环境温度三因素影响的3组平衡含水率模型,拟和模型系数。并分析了3组平衡含水率模型的相关系数、平均相对误差和标准差。结果表明,在相同的相对环境湿度和环境温度下,辐照剂量对稻谷的平衡有明显的影响。无论在吸附还是在解吸附过程中,辐照剂量越高稻谷的平衡含水率越低。此外,在试验范围内,修正的Chung-Pfost模型和修正的Henderson分别适合预测稻谷的解吸附和吸附过程中的平衡含水率。

EFFECT OF ~(60)Co γ-RAYS IRRADIATION ON EQUILIBRIUM MOISTURE CONTENT OF RICE

Experiments were carried out to study the effect of irradiation on the EMC(equilibrium moisture content) of rice.Irradiation dose was included in three widely used models for EMC,the parameters in models based on the experimental data,and correlation coefficient,mean relative error and standard error of moisture were studied for the better model.Experimental results show that gamma irradiation dose affects the values of EMC of grain at the same relative humidity and temperature of ambient.Values of the EMC decreased with increass of γ-rays irradiation dose during both adsorption and desorption process.Based on the correlation coefficient,mean relative error and standard error of moisture,the modified Chung-Pfost equation and the modified Henderson equation were found to fit the desorption and adsorption isotherms for rough rice grain in the range of experimental conditions.