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Intensity of scatter radiation on varying field size at the control panel area of mobile x-ray unit in Cebu Doctors' Hospital, Cebu City.


Bernardo  D. Caperonce III,
Samson T. Managaytay Jr.,
Fritz P. Mercado,
Orbelle G. Omaña,
Raquel E. Quizzagan,
Reynaldo Apolonio S. Tisado

Related Institution

College of Allied Medical Sciences – Department of Radiologic Technology - Cebu Doctors' University

Publication Information

Publication Type
Thesis Degree
Radiologic Technology
Publication Date
October 2002


Objective: This study determined the association between the intensity of scatter radiation on varying field size at the control panel area of mobile x-ray unit.

Design: This study utilized the quasi-experimental research design.

Settings: The study was conducted at x-ray room number four of the Radiology Department of Cebu Doctors' Hospital, Cebu City.

Subjects: Five (5) different sizes of cassettes were used to serve as field size guide and adjusted using the collimator.

Procedures/Interventions: A plastic container filled with water was used to approximate the thickness of the abdomen. The following measurements were determined: (1) between the x-ray tube and the water container at 40 inches, (2) between the objects and control panel area at 180 centimeters. The collimator was adjusted for the varying field sizes as determined by the different x-ray film cassette sizes. three (3) x-ray exposures were made in every field size and the radiation intensities at the control panel area were recorded using the following exposure technique: 83 kVp and 25 mAs.

Research Instrument/Measures: A Geiger-Muller Detector was used to measure the scatter radiation at the control panel of the mobile x-ray unit from the object. A researcher devised record sheet was used to document the following data: field size and intensity of scatter radiation at the control console area for exposure number one, two, and three.

Results: The results showed that for 8 x 10" field size, the mean and standard deviation was 3.67 ± 1.15 mR/ hr, 4.17 ± 0.29 mR/hr for 10 x 12" field size, 4.33 ± 0.29 mR/hr for 11 x 14" filed size, 6.00 ± 1.32 mR/hr for 14 x 14" field size, and 6.17 ± 0.29 mR/hr for 14 x 17" field size. comparisons were made between intensities measured at varying field sizes, between 8 x 10" and 14 x 17" between 10 x 12" and 14 x 17", and between 11 x 14" and 14 x 17". The results demonstrated significant difference.

Conclusion: The intensity of scatter radiation from the various field size at the control panel of the mobile x-ray unit increased as the x-ray beam field size was increased.


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Physical Location

LocationLocation CodeAvailable FormatAvailability
Cebu Doctors' University - Main Library U11 In8 Fulltext Print Format

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