In the frame of maintenance, upgrade and dismantling activities, activated equipment are removed from the accelerator complex and require characterization in view of their disposal as radioactive waste. The characterization process consists of a series of radiation measurements, complemented by analytical studies, which quantify the activity of radionuclides inside an object. A fraction of the radioactive waste produced at CERN presents contact dose-rates higher than 100 μSv/h, and can therefore be classified as LILW Waste (“Low and intermediate level radioactive waste”). These objects, due to the activation mechanisms, are often subject to large activity heterogeneities. The quantification of gamma-emitting radionuclides is typically performed by gamma spectrometry, under the assumption of homogeneous distributions of activity within an object. However, this assumption can lead to underestimating the activity value of such radionuclides. In this article we perform a gamma spectrometry qualification in order to quantify the impact of assuming homogenous distribution.

在维护，升级和拆卸活动的框架中，已激活的设备已从加速器综合体中移出，并且鉴于其作为放射性废物处置而需要进行表征。表征过程包括一系列辐射测量，并辅以分析研究，以量化物体内部放射性核素的活性。CERN产生的一部分放射性废物的接触剂量率高于100μSv/ h，因此可以归类为LILW废物（“中低水平放射性废物”）。由于激活机制，这些对象通常会遇到较大的活动异质性。发射伽马射线放射性核素的定量通常是在物体内活性均匀分布的前提下，通过伽马光谱法进行的。但是，这种假设可能导致低估此类放射性核素的活度值。在本文中，我们执行了伽马能谱鉴定，以量化假设均质分布的影响。