TY - JOUR

T1 - 210Po in black and green teas

AU - Puchkova, E. V.

AU - Bogdanova, O. G.

PY - 2016/1/1

Y1 - 2016/1/1

N2 - The 210Po content in various grades of tea sold in St. Petersburg shops was determined, and the effective annual dose of internal irradiation from 210Po at daily tea drinking was estimated. As shown by α-ray spectrometry, the activity concentration of 210Po in tea leaves varies from 1.1 to 25 Bq kg-1. The 210Po content in black teas is, on the average, 1.7 times higher than in green teas. This difference is accounted for by specific features of processes for the production of black and green teas. From 1.5 to 56% of 210Po passes into aqueous extracts. Despite higher polonium content in black teas, the amount of 210Po extracted from green teas is, on the average, 6.3 times higher than that extracted from black teas. This effect may be associated with the formation of water-soluble organic polonium compounds on the surface of tea leaves in the course of tea processing. The effective annual dose of internal irradiation from polonium at daily use of 10 g of dry tea is estimated at 0.8-9.5 μSv year-1 depending on the tea grade, or 0.5-5.8% of the average annual dose of irradiation of the Russian Federation population from the sum of the nuclides (210Pb, 210Po, 228Ra, 226Ra, etc., except 40K) getting into a human body with food and water.

AB - The 210Po content in various grades of tea sold in St. Petersburg shops was determined, and the effective annual dose of internal irradiation from 210Po at daily tea drinking was estimated. As shown by α-ray spectrometry, the activity concentration of 210Po in tea leaves varies from 1.1 to 25 Bq kg-1. The 210Po content in black teas is, on the average, 1.7 times higher than in green teas. This difference is accounted for by specific features of processes for the production of black and green teas. From 1.5 to 56% of 210Po passes into aqueous extracts. Despite higher polonium content in black teas, the amount of 210Po extracted from green teas is, on the average, 6.3 times higher than that extracted from black teas. This effect may be associated with the formation of water-soluble organic polonium compounds on the surface of tea leaves in the course of tea processing. The effective annual dose of internal irradiation from polonium at daily use of 10 g of dry tea is estimated at 0.8-9.5 μSv year-1 depending on the tea grade, or 0.5-5.8% of the average annual dose of irradiation of the Russian Federation population from the sum of the nuclides (210Pb, 210Po, 228Ra, 226Ra, etc., except 40K) getting into a human body with food and water.

KW - activity concentration of Po

KW - effective annual dose

KW - internal irradiation

KW - lead-210

KW - polonium-210

KW - tea (Camellia sinensis)

UR - http://www.scopus.com/inward/record.url?scp=84959542754&partnerID=8YFLogxK

U2 - 10.1134/S1066362216010161

DO - 10.1134/S1066362216010161

M3 - Article

AN - SCOPUS:84959542754

VL - 58

SP - 98

EP - 105

JO - Radiochemistry

JF - Radiochemistry

SN - 1066-3622

IS - 1

ER -