DIN 38404-15:1987
德国对水、废水和污泥的标准检验法.物理和物理化学参数(C组).测定饮用水、地下水、地表水和废水中单位容积的β放射性(C15)强度
German standard methods for the examination of water, waste water and sludge; physical and physico-chemical parameters (group C); determination of beta activity per unit volume in drinking water, ground water, surface water and waste water (C 15)