[en] With ²⁴¹Am as indicator, americium in the urine was concentrated by the method of codeposition, then it was purified by the method of anion exchange, at last, the americium was electroplated. ²⁴¹Am in the urine was analysed by six channel low level alpha measuring instrument and Alpha Spectrometer. The results show that the recovering ratio is beyond 60% under the condition that the indicator added to the urine is at the level of mBq. So, ²⁴¹Am in the urine can be quantitatively analysed by this method, uncertainty of the result is under 40%, detection limit of the instrument is under 10^-4 Bq. (authors)