• Title, Summary, Keyword: Exposure Conversion Formula

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A Study on the Measurement of the Personal Exposure Dose by Film Badge Dosimeter (필름배지선량계에 의한 개인피폭선량 측정에 관한 연구)

  • Chung, Woon-Kwan
    • Journal of Radiation Protection and Research
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    • v.19 no.1
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    • pp.37-50
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    • 1994
  • The experimental evaluation of exposure conversion formula using the relationship between optical photo-density, exposure dose and the quality of radiation characteristics of radiation energy to X-ray and ${\gamma}-rays$. The film badge dosimeter is analysed by exposure conversion formula which evaluate image fading characteristics for development time and directional characteristics for incident beam angle. In conclusion, exposure conversion formula evaluated of this study is satisfied with quality decision criterion of the film badge dosimeter.

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A study on assessment of bone mass from aluminum-equivalent image by digital imaging system (디지털 영상 시스템을 이용한 알루미늄 당량화상에 의한 골량 측정에 관한 연구)

  • Kim Jin-Soo;Choi Eui-Hwan;Kim Jae-Duk
    • The Journal of Korean Academy of Maxillofacial Radiology
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    • v.27 no.1
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    • pp.87-97
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    • 1997
  • The purpose of this study was to evaluate the method for quantitative assessment of bone mass from aluminum-equivalent value of hydroxyapatite by using digital imaging system consisted of Power Macintosh 7200/120, 15-inch color monitor, and GT-9000 scanner with transparency unit. After aluminum-equivalent image made from correlation between aluminum thickness and grey scale, the accuracy of conversion to mass from aluminum-equivalent value was evaluated. Measured bone mass was compared with converted bone mass from aluminum-equivalent value of hydroxyapatite block by correlation formula between aluminum-equivalent value of hydroxyapatite block and hydroxyapatite mass. The results of this study were as follow; 1. Correlation between aluminum thickness and grey level for obtaining aluminum-equivalent image was high positively associated(r²=0.99). Converted masses from aluminum-equivalent value were very similar to measured masses. There was, statistically, no significant difference(P<0.05) between them 2. Correlation between hydroxyapatite aluminum-equivalent and hydroxyapatite mass was shown to linear relation (r²=0.95). 3. Converted masses from aluminum-equivalent value of 3 dry mandible segments were similar to measured masses. The difference between the exposure directions was not significantly different(P<0.05).

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