X-RAY SHIELDING BARRIER ESTIMATION: A CASE STUDY OF RADIOLOGY DEPARTMENT, AHMADU BELLO UNIVERSITY TEACHING HOSPITAL, SHIKA – ZARIA
X-RAY SHIELDING BARRIER ESTIMATION: A CASE STUDY OF RADIOLOGY DEPARTMENT, AHMADU BELLO UNIVERSITY TEACHING HOSPITAL, SHIKA – ZARIA
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Date
2007-12
Authors
ESIEN-UMO, EMMANUEL OKON
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Abstract
The shielding barrier already constructed in the general radiography, fluoroscopy and
mammography rooms of Ahmadu Bello University Teaching Hospital, Shika and the
general radiography room of Barau Dikko Specialist Hospital, Kaduna was evaluated.
The evaluation was based on the shielding code called XRAYBARR, which is a routine
to calculate radiation shielding requirements for diagnostic radiology installations. This
code uses distances to the occupied area, x-ray tube information, workload and use factor,
and with the design dose limit and occupancy factor specified, to calculate the barrier
thickness required to reduce the total annual dose to acceptable limit. Area survey of the
already constructed shielding barrier was also carried out using TLDs. The calculated
values from XRAYBARR and the measured values from TLD readings were compared
to the shielding design already constructed. The results showed that the ratio of the
measured to design dose was less than 1(<1) for all the rooms indicating that the
measured dose beyond the barriers were lower than the design dose limit. The ratio of the
calculated to the design shielding barrier thickness was less than 1(<1) indicating that the
shielding already provided in the rooms were adequate. The general radiography rooms
in both hospitals were also compared. The area survey from TLD measurements and the
calculated shielding barrier thickness from XRAYBARR when compared to the design
dose and design barrier thickness were found to be satisfactory.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL, AHMADU
BELLO UNIVERSITY, IN PARTIAL FULFILLMENT OF THE REQUIREMENT
FOR THE AWARD OF MASTER OF SCIENCE IN RADIATION BIOPHYSICS
DEPARTMENT OF PHYSICS, FACULTY OF SCIENCE
AHMADU BELLO UNIVERSITY, ZARIA
NIGERIA
DECEMBER, 2007
Keywords
X-RAY,, SHIELDING,, BARRIER ESTIMATION