Natural Radioactivity Levels and Estimation of Radiation Exposure in
Environmental Soil Samples from Tulkarem Province-Palestine
15
4.3. Excess Lifetime Cancer Risk
Excess Lifetime Cancer Risk (ELCR) is calculated using
below equation [24], and shown in (Table 3).
ELCRAEDEDL RF (10)
where AEDE, DL and RF are the total annual effective
dose equivalent (in µSv·yr–1), duration of life (70 years)
and risk factor (Sv–1), fatal cancer risk per sievert. For
stochastic effects, ICRP 60 uses values of 0.05 for the
public [25]. The range of ELCR is 0.70 × 10–3 to 1.33 ×
10–3 with an average of 0.95 × 10–3. According to these
results, the risk of cancer is negligible.
5. Conclusions
Gamma ray spectrometry was exploited to determine ac-
tivity concentration due to naturally occurring 226Ra, 232Th,
40K and 137Cs radioisotopes and the associated radiation
hazard levels in 72 of soil samples from some areas in
the 12 different locations of Tulkarem district in West
Back-Palestine. The average concentration for 226Ra
(238U series), 232Th, 40K and 137Cs are 34.5, 23.8, 120.0,
and 7.8 Bq·kg–1 respectively. These average activity con-
centrations were lower than the world average values. It
is concluded that no harmful radiation effects were posed
to the population who live in the study area.
The average dose rates and other calculated hazard in-
dices were lower than the average national and world
recommended values, therefore, did not pose health risks
to the population of the area. The total annual effective
dose was lower than the 1 mSv·yr–1 dose limit recom-
mended by the ICRP for public radiation exposure control.
The results in this study compared well with other studies
carried out in other countries and with the worldwide
average activity concentrations. This study also showed
that risk of cancer is negligible in the region under inves-
tigation. This study is considered to be first conducted in
this area (North west bank), so we recommend that this
study can be used as a baseline for information or further
research.
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