الفهرس 
Sources of Natural Background RadiationOnly 14 pages are availabe for public view
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Abstract
The thesis aimed to focuses some light on studies of
radioactive pollution of the Suez region Egypt using different
spectroscopic technique.
Natural radiation arises in outer space, where cosmic rays are
formed and on the earth where radionuclides present in soil, air,
water and food. Other contributions depend strongly on human
activities and practices, thus the Human exposure occurs by
irradiation from different sources.
First, the concentration of the natural radionuclides in the
studied samples were measured to find the specific radioactivity
content of
238
U- series,
232
Th series and
40
K by using a high
resolution gamma ray spectrometer based on coaxial HPGe
detector shielded by cylinders of lead, copper and cadmium. The
analysis of data is completed by using a computerized analyzer
fitted with a high multichannel analyzer with high level software
programs.
Second, radon has been measured by using solid state nuclear
track detectors (CR-39). (SSNTDs) have been widely applied for
the measurement of mean radon activities in human environments
along the last decades because they have some important
properties to be used as a detector like a good electrical insulator,
stable when subjected to high doses of radiation and highly
sensitive for α-particles.
Twenty six samples were collected from different factories in
El Sokhna and Suez city, Egypt, which classified into three
categories soil, sediment and leaves. Calculate the radiological parameters (Radium equivalent
activity Ra
eq, Radiation level index, External hazard index H
ex
,
Internal hazard index H
in, Absorbed dose rate D
R
, Effective dose
Eeff
) and Excess lifetime cancer risk (ELCR) , to make a
comparison with the permissible international level.
from the result analysis, the specific activities of
238
U,
232
Th
and
40
K were found to be lower than the permissible level for
most samples except textile factory and the leaves around this
factory .
This may indicate that workers in this factory receive the
highest total effective doses due to inhalation of dust containing
radon. And the workers in that area has must be taken possible
precautions and protection against the high radioactivity level.
The results of measurements will serve as base line data and
background reference level for El Sokhna and Suez city in Egypt.
The area under investigation is safe except textile factory so
workers in this factory must be careful and taking possible
precautions and protection.