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首页> 外文会议>Institute of Nuclear Materials Management annual meeting >NEW ALGORITHMS FOR THE ANALYSIS OF WASTE CHARACTERIZATION
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NEW ALGORITHMS FOR THE ANALYSIS OF WASTE CHARACTERIZATION

机译：用于分析废物特征的新算法

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Nondestructive assay of gamma-ray emitting nuclear waste requires modeling because it is not practical to prepare a standard that matches the physical and nuclear properties of every waste item.The use of a high-purity germanium(HPGe)detector simplifies the spectral analysis process.Many models use simplified efficiency determinations and attenuation corrections. These models often work well for medium-sized items measured at detector-to-item distances that are at least half of the largest dimension of the object.Other models use a hybrid Monte Carlo approach,but the detector efficiency parameters must be established at an additional cost. A new algorithm has been developed to reduce these complications and limitations while retaining acceptable accuracy.This algorithm uses a simple mixed-nuclide gamma calibration, the detector crystal diameter and length,crystal type(n-type or p-type),thickness of the germanium dead layer,and distance from the top of the end cap to the germanium active layer to compute the detector intrinsic efficiency.The intrinsic efficiency for the front and side of the detector are correlated with the detector diameter and length.Corrections for the gamma rays from the item being measured are calculated voxel by voxel.These new algorithms have been implemented in the ORTEC? ISOTOPIC software version 4.Results show significant improvement for items counted as close as 10 cm,and are useful for the measurement of items positioned in a low-level drum counter.
机译：伽玛射线发射核废料的无损测定需要进行建模，因为它是不实际的是制备相匹配的每item.The使用高纯度的锗的废物的物理和核特性标准（高纯锗）检测器简化了频谱分析过程。许多型号使用简化的效率测定和衰减校正。这些模型往往在检测到项目的距离测量的是object.Other车型的最大尺寸的至少一半使用混合蒙特卡洛方法大中型项目运行良好，但探测器效率参数必须在建立附加费用。的新算法已经被开发，以减少这些并发症和限制，同时保持可接受的accuracy.This算法使用一个简单的混合核素伽马校准，检测器晶体的直径和长度，晶体类型（n型或p型），的厚度从端帽到锗活性层的顶部死锗层，和距离来计算所述探测器固有用于检测器的前部和侧效率。固有效率与检测器和直径为length.Corrections伽马射线相关从项目被测量由voxel.These新的算法计算出的体素已在ORTEC执行？同位素软件版本4.Results示出了用于计算尽可能接近10厘米项显著改善，并且可用于放置在一个低级别的感光鼓计数器项目的测量是有用的。

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