The specific radioactivity concentrations in the coal fly ash obtained from heat producing stations in Korea were analyzed and its radiological hazard for reuse in construction purpose was evaluated. The concentrations of uranium isotopes in the real fly ash measured by TBP solvent extraction method and $alpha$-spectrometer were found to be about 116.1 Bq $kg^{-1}$ for $^{238}U$, 5.01 Bq $kg^{-1}$ for $^{235}U$, and 121.2 Bq $kg^{-1}$ for $^{234}U$, respectively. The activity ratio of $^{234}U/^{238}U$, in the coal fly ash was in $1.04;{pm};0.03$, which is similar to that of uncontaminated Korean soil in natural conditions (1.14). The specific radioactivities of $^{226}Ra,;^{232}Th,;and;^{40}K$ in the coal fly ash were also determined using $gamma$-spectrometer with a HPGe detector The results showed that $^{226}Ra,;^{232}Th,;and;^{40}K$ in the coal fly ash were in concentrations of $101.7{sim}113.9$, $39.5{sim}54.2;and;315.0{sim}990.6$ Bq $kg^{-1}$, respectively. With the specific radioactivities obtained from $gamma$-spectrometric measurements of the coal fly ash, its radiological hazard for reuse was evaluated. The result showed that the radioactivity of the coal fly ash was in permissible level.
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