计算剂量当量的辐射品质因数Q是按辐射的传能线密度(LET)而定;计算当量剂量的辐射计权因子W_R则是依据辐射在低剂量、低剂量率时诱发随机效 The radiation quality factor Q for calculating the dose equivalent is determined by the energy transfer density (LET) of the radiation; the radiometric weight factor W_R for calculating the equivalent dose is based on the radiation induced random effects at low and low dose rates