Abstract: THE DETERMINATION OF~210Pb IN COAL，C0AL ASH，COAL CINDER AND SOILJIA GUOGANG（China Instiute of Atomic Energy,Beijing，102413）ABSTRACT A radiochemical method is described for the determination of~210Pb in coal,coal ash,coal cin-der and soil. The procedure includes sample dry ashing ，leaching with HCl（1＋1），separationwith anion－exchange resin ，purification as PbS precipitate and~210Bi beta counting. This methodprovides a good separation of~210Pb from other natural and artificial beta emitters. The half-life of~210Bi determined from the sample sources is 5．50d ，which is close to the published value（5．01d）.The lower limits of detection are 7．6×10~（￣4）Bq／g for 10g coal sample and 1．5×10~（￣3）Bq／g foreach and every 5g of coal ash ， coal cinder and soil samples. The~210Pb contents in the analyzedcoal，coal ash，coal cinder and soil samples are 0．0316±0．0097，0．072±0．0760，0．0109±0．0035 and 0．0355±0．0173Bq／g and the chemical yields are 95．1％±2．5％，97．2％±2．O％，93．5％±1．6％and 95．7％±1．5％respectively. The enrichment factors（E_f）of~210 in coalash，defined as the ratio of the content of~210Pb in coal ash to that in coal，range from 1．60 to11．8．Although no expensive instruments are used，this rnethod gives precision results. Four sam-ples can be analyzed within 12h （not including the time for counting）．This technique is suitablefor sample analysis on the environmental impact assesssment of the coal－fuel power plant.Key words Coal Coal ash Coal cinder Soil~210Pb