In a nuclear or radiological accident scenario, where members of the public can potentially take up anthropogenic radionuclides released in atmosphere, verified methods to fast screen for internal contamination a large number of individuals directly on the field can play a major role to adopt appropriate countermeasures. At the ENEA Casaccia Research Centre (Rome, Italy), a spectrometric monitoring method, based on a portable HpGe detector Trans-Spec-DX-100, has been developed. In this work, the results of the 2019 measurement campaign, where the method sensitivity was tested, in terms of detection limits (DL) for common fission and (some) activation products by acquiring gamma spectra on 102 uncontaminated volunteers (57 adults, 45 children between 7 and 12 years of age) are presented. The spectra, collected with acquisition time of 180 s, have been analysed according to the Standard ISO 28218 for the activity detection limit (Bq) calculations and according to ICRP Publications 134, 137, and 141 for the related minimum measurable committed effective dose. The measurements were taken in open field on a paved surface, in the presence of an environmental radiation background, given in term of ambient dose equivalent rate, \(\dot{H}\)*(10), equal to 0.230 ± 0.020 μSv/h, in order to study both the potentiality and the limitation of the technique with a significant statistic. The results are presented and discussed particularly focusing on the specific characteristics of the technique, in respect to features reported by the European Council Directive 2013/59/Euratom and the International Atomic Energy Agency (IAEA) document STI/PUB/1708 (2015), and to techniques described in the current literature.

在核事故或放射性事故中，公众有可能吸收释放到大气中的人为放射性核素，因此，为迅速筛查直接在现场的大量人员进行内部污染的经过验证的方法，在采取适当对策方面将发挥重要作用。在ENEA Casaccia研究中心（意大利罗马），开发了一种基于便携式HpGe检测器Trans-Spec-DX-100的光谱监测方法。在这项工作中，通过在102名未受污染的志愿者（57名成人，45名儿童）上获得了γ谱图，对2019年测量活动的结果进行了测试，以测试方法裂变的检出限（DL）为依据，测试了方法的敏感性（年龄介于7至12岁之间）。采集时间为180 s的光谱，根据标准ISO 28218对活动检测极限（Bq）的计算进行了分析，并根据ICRP出版物134、137和141对相关的最小可测量承诺有效剂量进行了分析。测量是在存在环境辐射背景的情况下，在铺装表面的开阔区域中进行的，以环境剂量当量率表示\（\ dot {H} \）*（10），等于0.230±0.020μSv/ h，以便使用显着统计量研究该技术的潜力和局限性。呈现和讨论结果时，特别是针对该技术的特定特征，涉及欧洲理事会指令2013/59 / Euratom和国际原子能机构（IAEA）文件STI / PUB / 1708（2015）报告的特征，以及当前文献中描述的技术。