골밀도 검사실 산란선량 평가 및 방사선 방호 최적화 방안 연구
Scattered Dose Evaluation in Bone Density Scan Laboratories and Study of Optimization Methods for Radiation Protection
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This study aimed to evaluate scattered radiation doses in bone densitometry examination rooms usingoptically stimulated luminescent dosimeters (OSLDs) and to develop optimization strategies for radiation protection. Seven bone densitometry equipment units were monitored for one month using OSLDs. Scattered radiation doseswere analyzed according to shielding type, console position, and quality assurance (QA) implementation status. Monte Carlo N-Particle eXtended (MCNPX) simulation methodology was applied for theoretical validation. Diagnostic reference levels (DRLs) were established based on the 75th percentile of measured data. The per-personscattered radiation doses ranged from 0.173 to 0.761 μSv, showing a 4.4-fold difference among equipment. Ceilingtype shielding (0.409 μSv) demonstrated lower doses than partial shielding (0.479 μSv). Console position at thepatient's head side resulted in 15% lower doses compared to the foot side. Equipment with QA implementationshowed 84% lower doses (0.329 vs 0.605 μSv). The DRL was established at 0.527 μSv per examination. Twoequipment units exceeded the DRL, requiring priority improvement. All measured doses were well belowinternational radiation protection limits (ICRP 20 mSv/year). However, significant variations in scattered radiationdoses were observed based on shielding configuration, console positioning, and QA implementation. Systematicradiation protection optimization through ceiling-type shielding, appropriate console positioning, and regular qualityassurance is essential for optimal radiation safety in bone densitometry facilities.
Abstract
This study aimed to evaluate scattered radiation doses in bone densitometry examination rooms usingoptically stimulated luminescent dosimeters (OSLDs) and to develop optimization strategies for radiation protection. Seven bone densitometry equipment units were monitored for one month using OSLDs. Scattered radiation doseswere analyzed according to shielding type, console position, and quality assurance (QA) implementation status. Monte Carlo N-Particle eXtended (MCNPX) simulation methodology was applied for theoretical validation. Diagnostic reference levels (DRLs) were established based on the 75th percentile of measured data. The per-personscattered radiation doses ranged from 0.173 to 0.761 μSv, showing a 4.4-fold difference among equipment. Ceilingtype shielding (0.409 μSv) demonstrated lower doses than partial shielding (0.479 μSv). Console position at thepatient's head side resulted in 15% lower doses compared to the foot side. Equipment with QA implementationshowed 84% lower doses (0.329 vs 0.605 μSv). The DRL was established at 0.527 μSv per examination. Twoequipment units exceeded the DRL, requiring priority improvement. All measured doses were well belowinternational radiation protection limits (ICRP 20 mSv/year). However, significant variations in scattered radiationdoses were observed based on shielding configuration, console positioning, and QA implementation. Systematicradiation protection optimization through ceiling-type shielding, appropriate console positioning, and regular qualityassurance is essential for optimal radiation safety in bone densitometry facilities.