Full Length Research Paper
Determination of
Annual Effective Doses from
Radionuclide’s Due to Intake of
Fruits from Bulsa Farms, Chikun
L.G.A of Kaduna State, Nigeria.
Onoja, R.A1*, Onoja, R.O2, Idoko,
E.E3 and Ogbeh, E4
Abstract
The activity concentration
of three primordial
radionuclides was measured
in the fruits and soil
samples obtained from Bulsa
Farms using the Gamma-Ray
Spectrometry method with
NaI(Ti) detector. Results
for 40K range
from147.43 to 465.94 BqKg-1,
that of 226Ra
varied from 1.84 to 4.14
BqKg-1 and
232Th figures are in
the range of 51.88 to 119.04
BqKg-1. The
activity concentration of
232Th for both
surface soil and deep soil
samples are higher than the
United Nations Scientific
Committee on Effects of
Atomic Radiation (UNSCEAR)
limit for areas of normal
background radiation. The
soil-to-fruit transfer
factors for those
radionuclides were also
determined and the figures
range from 0.5138 to 1.6238
for 40K, 0.4058
to 0.7416 for 226Ra,
and 0.4358 to 0.6562 for
232Th. The annual
effective dose (AED) due to
intake of these fruits was
estimated and the results
are 0.2487, 0.3489, 0.2361,
0.2308 and 0.2547 mSvyr-1
for tomato, orange,
pineapple, mango and banana
respectively. Only the value
for orange exceeds the
UNSCEAR limit of 0.29 mSvyr-1
for internal exposure per
individual, while values for
all other fruits were lower
than this limit.
Key words: Activity
Concentration,
Radionuclide’s, Transfer
factor, Annual Effective
Dose, Fruits.
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