No abstract

238 U, 232 Th, 226 Ra, 222 Rn and 40 K activity concentrations in fertilizer samples collected from a local market were determined. Radon activity concentrations ranged from 0.04-252 Bq kg −1 and were comparable with low activity concentrations ranges reported previously. Radon exhalation rates and effective 226 Ra concentration were determined using CR-39 solid-state nuclear track detectors. Effective 226 Ra concentrations ranged from 4.27-33.93 Bq kg −1 . Two different 222 Rn exhalation rates were determined; area dependent exhalation rates (0.044-0.351 Bq m −2 h −1 ) and mass dependent exhalation rates (0.023-0.180) Bq kg −1 h −1 ). Even without secular equilibrium, strong correlations were generally apparent among uranium concentrations, effective 226 Ra concentrations and 222 Rn exhalation rates in samples with high concentrations of uranium. 232 Th and 40 K concentrations ranged from 0-44.6 and 0.08-127 µg/g, respectively.