Determination the Specific Activity of ????????????, ????????????????, ???????????????????? and ???????????????????? and Annual Effective Dose in milk consumed in Basra south of Iraq

Abstract

The objective of the present work is to determine the specific activity
levels (Bq/L ) or (Bq/kg) for natural radionuclide 40???? (long-lived), and to
the anthropogenic radionuclides 131????, 134???????? ???????????? 137???????? (short-lived) for
sixteen samples of fresh and powdered imported milk. The analysis was
carried out using gamma ray spectrometer SAM-940TM based on NaI (Tl)
detector. Also the effective doses (Sv/year) were calculated for each
sample.
The estimated average effective dose for adults from fresh milk samples
were found to be 0.109mSv/y, 10.345nSv/y, 14.221nSv/y, 1.390nSv/y for
(40????, 131????, 134????????, 137????????) respectively. And average effective dose for
children from fresh milk samples were found to be 0.267mSv/y,
28.527nSv/y, 12.225nSv/y, 1.248nSv/y for (40????, 131????, 134????????, 137????????)
respectively. The estimated average annual effective dose for adults from
dry imported milk samples were found to be 0.715mSv/y, 67.598nSv/y,
42.576nSv/y, 15.143nSv/y for (40????, 131????, 134????????, 137????????) respectively, And
average annual effective dose for children from dry imported milk samples
were found to be 0.955mSv/y, 185.004nSv/y, 35.969nSv/y, 13.486nSv/y
for (40????, 131????, 134????????, 137????????) respectively.
The annual effective dose for anthropogenic radionuclide measured in this
research for each local fresh milk and dry imported milk it is less than the
published values in UNSCEAR recommended reference of (200- 800)
μSv/y they are within acceptable limits. And for potassium radioactive
element 40????, all values were within the limit with the exception of four
samples produced in New Zealand, was higher than the allowable limit as
the limit of natural isotopes have 1mSv/y according to the ICRP standards.