Several kinds of tea, camomile and herbal tea were analysed to determine natural and artificial radioactivity. The radionuclides were determined by alpha ( 210 Po) and gamma ( 228 Ac, 214 Pb, 214 Bi, 210 Pb, 40 K and 137 Cs) spectrometry. 228 Ac ranged between 0.6 and 9.0 Bq kg −1 dry ; 210 Po between 1.90 and 36.1 Bq kg −1 dry ; 214 Pb and 214 Bi between 0.7 and 4.9 Bq kg −1 dry ; 210 Pb between < 10.0 and 58.9 Bq kg −1 dry ; 40 K between 463 and 936 Bq kg −1 dry ; 137 Cs between < 0.3 and 2.6 Bq kg −1 dry . The percentage of 210 Po extraction in infusion was also determined; the arithmetical mean value of percentage of 210 Po extraction resulted 20.7 ± 7.50.
Microchemical Journal – Elsevier
Published: May 1, 2011
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