This research was dedicated to the study of the background levels of 210Po and natural gamma emitters as 40K, 214Pb, 214Bi, 228Ac, 212Pb and 212Bi in coffee powder and in coffee beverage; also the artificial 137Cs was determined. In the coffee powder the mean 210Po activity resulted 7.25 10-2 ± 2.25 10-2 Bqkg-1. 40K showed a mean activity of 907.4 ± 115.6 Bqkg-1. The mean activity concentration of 214Pb and 214Bi, indicators of 226Ra, given as mean value of the two radionuclides, resulted 10.61 ± 4.02 Bq kg-1. 228Ac, 228Ra indicator, showed a mean activity concentration of 13.73 ± 3.20 Bq kg-1. The mean activity concentration of 212Pb, 224Ra indicator, was 8.28 ± 2.88 Bq kg-1. 208Tl, 224Ra indicator, presented a mean activity concentration of 11.03 ± 4.34 Bq kg-1. In all samples, the artifical 137Cs resulted below the detection limit (2.0 Bq kg-1). The arithmetical mean value of percentage of 210Po extraction in coffee beverage resulted 20.5 ± 6.9. The percentage of transfer of gamma emitters,40K, 214Pb, 214Bi, 228Ac, 212Pb, 208Tl resulted of 80.0% %, 33.5 %, 24.7 %, 30.0 %, 35.1 %, 53.5% for 40K, 214Pb, 214Bi, 228Ac, 212Pb and 208Tl respectively.
Radioactivity in coffee
ROSELLI, CARLA;DESIDERI, DONATELLA;FEDUZI, LAURA
2013
Abstract
This research was dedicated to the study of the background levels of 210Po and natural gamma emitters as 40K, 214Pb, 214Bi, 228Ac, 212Pb and 212Bi in coffee powder and in coffee beverage; also the artificial 137Cs was determined. In the coffee powder the mean 210Po activity resulted 7.25 10-2 ± 2.25 10-2 Bqkg-1. 40K showed a mean activity of 907.4 ± 115.6 Bqkg-1. The mean activity concentration of 214Pb and 214Bi, indicators of 226Ra, given as mean value of the two radionuclides, resulted 10.61 ± 4.02 Bq kg-1. 228Ac, 228Ra indicator, showed a mean activity concentration of 13.73 ± 3.20 Bq kg-1. The mean activity concentration of 212Pb, 224Ra indicator, was 8.28 ± 2.88 Bq kg-1. 208Tl, 224Ra indicator, presented a mean activity concentration of 11.03 ± 4.34 Bq kg-1. In all samples, the artifical 137Cs resulted below the detection limit (2.0 Bq kg-1). The arithmetical mean value of percentage of 210Po extraction in coffee beverage resulted 20.5 ± 6.9. The percentage of transfer of gamma emitters,40K, 214Pb, 214Bi, 228Ac, 212Pb, 208Tl resulted of 80.0% %, 33.5 %, 24.7 %, 30.0 %, 35.1 %, 53.5% for 40K, 214Pb, 214Bi, 228Ac, 212Pb and 208Tl respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
