Mountford P J, O'Doherty M J, Harding L K, Thomson W H, Carter N J, Bray D, Paul C, Batchelor S
Department of Nuclear Medicine, Kent and Canterbury Hospital, Canterbury, UK.
Nucl Med Commun. 1991 Aug;12(8):709-18.
Infants or children undergoing nuclear medicine investigations may subsequently come into close contact with nurses or parents responsible for their care. In order to estimate the radiation dose to these individuals, and to formulate appropriate recommendations, dose rates were measured at distances of 0.1, 0.5 and 1.0 m from 148 paediatric patients who had undergone one of 12 99Tcm studies. The maximum dose rates of 70, 14 and 5 microSv h-1 at these distances were not greater than the corresponding maximum values found in an earlier study of adult patients. However, the maximum dose rates per unit activity of 0.5, 0.2 and 0.1 microSv h-1 MBq-1 were greater than the corresponding maximum 99Tcm adult values, consistent with a general increase of dose rate per unit activity with decrease of body weight observed in the paediatric measurements. A parent caring for and feeding a young infant is most unlikely to receive a dose equivalent of 1 mSv, and a nurse attending to one young radioactive patient is most unlikely to receive a dose equivalent in a working day of 60 microSv. The data obtained should allow radiation doses to be estimated and appropriate recommendations to be formulated for other circumstances, including any future legislative changes in dose limits or derived levels.
接受核医学检查的婴幼儿随后可能会与负责照料他们的护士或父母密切接触。为了估算这些人员所接受的辐射剂量并制定适当的建议，我们对148名接受过12种99锝（99Tcm）检查之一的儿科患者，在距离其0.1米、0.5米和1.0米处测量了剂量率。在这些距离处测得的最大剂量率分别为70、14和5微希沃特每小时（μSv h-1），不高于早期对成年患者研究中发现的相应最大值。然而，每单位活度的最大剂量率，即0.5、0.2和0.1微希沃特每小时每兆贝可（μSv h-1 MBq-1），高于99Tcm成年患者的相应最大值，这与儿科测量中观察到的每单位活度剂量率随体重减轻而普遍增加的情况一致。照料并喂养幼儿婴儿的父母极不可能接受相当于1毫希沃特（mSv）的剂量，而护理一名放射性幼儿患者的护士在一个工作日极不可能接受60微希沃特的剂量。所获得的数据应有助于估算辐射剂量，并为其他情况制定适当的建议，包括未来剂量限值或导出水平的任何立法变更。
