TongD,andXuR.Effectsof ureaand(NH4)2SO4onnitrificationandacidificationof Ultisols from Southern China[J]. J EnvironSci, 2012, 24: 682~689. more appropriate physical properties, such as lutetium-177 or copper-67, as well as alpha-emitting radionuclides, including astatine-211, bismuth-213, actinium-225, and others are