Radiation dose rate assessment around patients in PET/CT units

Q4 Energy International Journal of Nuclear Energy Science and Technology Pub Date : 2018-06-26 DOI:10.1504/IJNEST.2018.10013861

M. M. El-din, R. Mahmoud, I. Eid, M. R. E. El-din, R. Rizk

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Abstract

The objective of this paper is to assess the radiation exposure resulting from radioactive patients injected with different activities of 2-[18F] fluoro-2-deoxy-D-glucose (18F-FDG) in Positron Emission Tomography/Computed Tomography (PET/CT) units. This objective is fulfilled by measuring the dose rates practically inside and outside PET/CT rooms around radioactive patients using a calibrated survey meter. Afterwards, the dose rates are estimated mathematically using Monte Carlo simulation model. The results show that the dose rates on patient's body surface decrease greatly with distance and it is recommended for PET/CT staff to stand at distances more than 1.5 m from radioactive patients if possible during direct contact. Also, it is found that the shielding thickness in the selected room dimensions is adequate and effective for the γ-radiation arising from radioactive patients. The practically measured dose rates around radioactive patients are quite similar to mathematically predicted results and slight differences may be attributed to the difference between the estimated 18F biological half life time and real biological half life time due different biological uptake or excretion time from one patient to another.

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PET/CT单元患者周围的辐射剂量率评估

本文的目的是评估放射性患者在正电子发射断层扫描/计算机断层扫描（PET/CT）装置中注射不同活性的2-[18F]氟-2-脱氧-D-葡萄糖（18F-FDG）引起的辐射暴露。这一目标是通过使用校准的测量仪测量放射性患者周围PET/CT室内外的剂量率来实现的。然后，使用蒙特卡罗模拟模型对剂量率进行数学估计。结果表明，患者体表的剂量率随着距离的增加而大大降低，建议PET/CT工作人员在直接接触放射性患者时，尽可能站在距离放射性患者1.5米以上的地方。此外，研究发现，在选定的房间尺寸中，屏蔽厚度对放射性患者产生的γ辐射是足够和有效的。放射性患者周围实际测量的剂量率与数学预测的结果非常相似，微小的差异可能归因于估计的18F生物半衰期与实际生物半衰期之间的差异，这是由于患者之间的生物摄取或排泄时间不同。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Nuclear Energy Science and Technology Energy-Nuclear Energy and Engineering

CiteScore

0.80

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0.00%

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期刊介绍： Today, nuclear reactors generate nearly one quarter of the electricity in nations representing two thirds of humanity, and other nuclear applications are integral to many aspects of the world economy. Nuclear fission remains an important option for meeting energy requirements and maintaining a balanced worldwide energy policy; with major countries expanding nuclear energy"s role and new countries poised to introduce it, the key issue is not whether the use of nuclear technology will grow worldwide, even if public opinion concerning safety, the economics of nuclear power, and waste disposal issues adversely affect the general acceptance of nuclear power, but whether it will grow fast enough to make a decisive contribution to the global imperative of sustainable development.