DIN 38414-15:1990 德国对水、废水和污泥的标准检验法.污泥和沉积物(S组).污泥、沉积物和悬浮物中特殊残余β放射性测定
German standard methods for the examination of water, waste water and sludge; sludge and sediments (group S); determination of the specific residual beta activity in sludge, sediment and suspended matter (S 15)