The natural radioactivity in phosphate fertilizers used in central Italy has been measured by alpha and gamma spectrometry. The results show that the specific activities of 238 U, 234 U and 235 U ranged within interval from < 0.5 to 2628.8, from < 0.5 to 2826.3 and from < 0.9 to 138.0 Bq kg − 1 respectively and those of 210 Pb and 210 Po ranged within interval from < 15.0 to 401.5 and < 0.5 to 351.6 Bq kg − 1 respectively. The 228 Th, 230 Th and 232 Th concentrations found by alpha spectrometry ranged from < 0.5 to 50.2, from 0.9 to 2727.2 and from < 0.5 to 60.8 Bq kg − 1 respectively. 226 Ra and 228 Ra activity concentrations ranged from < 14.3 to 290.9 and from < 2.9 to 24.9 respectively. 40 K specific activities ranged from 39.2 to 8263.7 Bq kg − 1 . A very good correlation exists between the activity concentrations found by alpha spectrometry and those found by gamma spectrometry.
Microchemical Journal – Elsevier
Published: Mar 1, 2009
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