Roslan, Nur Amanina Izzati Mohd
(2016)
Measurement of entrance surface air
kerma by using direct method: a
comparison study.
Project Report.
Universiti Sains Malaysia.
(Submitted)
Abstract
Dosimetry has increasing its importance in the radiation safety culture and
protection purpose. Assessment of entrance skin doses in conventional diagnostic
radiology should be evaluated in order minimizing hazard in delivering optimum
radiation dose amount. The entrance surface air kerma was determined by directly
measured using TLDs in two common radiography examination PA chest and
abdomen. Results were analyzed in variable objectives according to this study.
Measurement using direct method done with selected parameter from the previous
study by Taha et al., 2014. For parameter 81 kVp with 12.5mAs for anterioposterior
(AP) projection of the abdomen, mean dose obtained was 1.96 mGy compared to
previous study which value 2.50 mGy. were For chest radiograph procedure,
parameter of were 125 kVp, 1.6 mAs, for posterioanterior (PA) projection give the
mean dose of 0.21 mGy than the previous study at 0.14mGy. Eventhough the values
does not achieved in similar, ESAK was still below the reference level suggested by
IAEA (2004), 0.3 mGy for chest PA, and 10 mGy for abdomen AP. The result of this
study showed that the ESAK values were still in acceptable range doses from
common radiological examinations. Method of calculation can be used if the TED
was available for ESAK measurement if its deviation quite small.
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