The effect of beam tube potential variation on gonad dose to patients during chest radiography investigated using high sensitivity LiF:Mg,Cu,P thermoluminescent dosemeters
K K L Fung, PhD, FIR, MSc
1 and
W B Gilboy, PhD, FInstP, CPhys
2
1 Department of Optometry and Radiography, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
2 Department of Physics, The University of Surrey, Guildford GU2 7XH, UK
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Figure 1. Rando phantom placed against the vertical bucky in the standard chest radiograph projection. The ionization chamber of the dose–area product meter was attached at the light beam diaphragm.
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Figure 2. Radiograph of the pelvis of the Rando phantom. The black arrowhead indicates the position of the ovarian site on the right side of the pelvis.
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Figure 3. Variation of X-ray tube current (mAs) with tube potential (kVp) for constant exit dose (low tube potential technique).
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Figure 4. Variation of entrance surface dose (ESD) with tube potential (kVp) (low tube potential technique).
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Figure 5. Variation of dose–area product (DAP) with tube potential (kVp) (low tube potential technique).
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Figure 6. Variation of gonad dose with tube potential (kVp) (low tube potential technique).
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Figure 7. Variation of effective dose with tube potential (kVp) (low tube potential technique). ESD, Entrance surface dose; DAP, dose–area product.
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Figure 8. Variation of dose–area product (DAP) with entrance surface dose (ESD) (low tube potential technique).
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Figure 9. Variation of gonad dose with tube potential (kVp) (high tube potential technique).
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Figure 10. Variation of effective dose with tube potential (kVp) (high tube potential technique). ESD, Entrance surface dose; DAP, dose–area product.
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Copyright © 2001 by the British Institute of Radiology.
