Willegaignon J, Guimarães Maria I C, Sapienza Marcelo T, Stabin Michael G, Malvestiti Luiz F, Marone Marília, Sordi Gian-Maria A A
Radiological Protection Service, Instituto de Pesquisas Energéticas e Nucleares, Av. Prof. Lineu Prestes, 2242, Cidade Universitaria, CEP 05508-000, São Paulo, Brazil.
Health Phys. 2006 Dec;91(6):624-9. doi: 10.1097/01.HP.0000225467.10064.34.
The measurement of exposure rates is fundamentally important in the release of patients given radioactive materials and for keeping the exposures of others as low as reasonable achievable. Similar measurement methodologies have generally been used for point and extended sources, but this approach may lead to methodological errors in calculating radiation dose estimates. In this study, nuclear medicine patients who received high activities of Na131I for therapy were monitored using different measurement methodologies, and the results showed that the usual measurement performed at 1.0 m in front of the body resulted in a mean error of 40% between experimental and theoretical exposure rates. The best measurements were obtained when performed at 2.0 m in front of the patients. With this approach, the error was about 2% between experimental and theoretical values. These findings suggest a new methodology for patients' measurement in nuclear medicine and could be useful for personal monitoring in cases of radiological emergencies involving 131I ingestion.
在给予放射性物质的患者出院时，以及为使其他人的暴露尽可能低至合理可行水平，暴露率的测量至关重要。对于点源和扩展源，通常采用类似的测量方法，但这种方法在计算辐射剂量估计值时可能会导致方法误差。在本研究中，使用不同的测量方法对接受高活度Na131I治疗的核医学患者进行了监测，结果表明，通常在身体前方1.0米处进行的测量导致实验暴露率与理论暴露率之间的平均误差为40%。在患者前方2.0米处进行测量时，得到了最佳结果。采用这种方法，实验值与理论值之间的误差约为2%。这些发现提示了一种核医学患者测量的新方法，并且在涉及摄入131I的放射紧急情况中进行个人监测时可能会有用。
