This work defines directionality as the act of estimating a radiation source’s angular coordinate on the horizontal plane within a single measurement, usually up to a few seconds. This work develops a directionality algorithm for general use in wearable, closely packed detector arrays. The algorithm was demonstrated on three $2^{″}\times 2^{″}\times 4^{″}$ NaI(Tl) detectors. Directionality performance was quantitatively assessed by observing misclassification rates within the confusion matrices. These misclassification behaviors were condensed into a single number, the Mean Absolute Error (MAE), and a trend between directionality performance and uncollided gamma fluence is reported. The MAE was measured to be 8.2$°$ using a 113.4 $\mathrm{\mu }$Ci Cs-137 source and 17.8$°$ using a 34.6 $\mathrm{\mu }$Ci Co-60 source, where both sources were placed 172.4 cm away. Finally, this directionality algorithm was demonstrated in the case of static detector array with a moving source where an MAE of 12.7$°$ was observed for a 113 $\mathrm{\mu }$Ci Cs-137 source at an average distance of 350.0 cm away.

这项工作将方向性定义为在一次测量中通常在几秒钟内估算辐射源在水平面上的角坐标的动作。这项工作开发了一种方向性算法，可普遍用于可穿戴，紧密包装的探测器阵列中。该算法在三个方面进行了演示$2^{\text{'}\text{'}}\times 2^{\text{'}\text{'}}\times 4^{\text{'}\text{'}}$NaI（Tl）检测器。通过观察混淆矩阵内的误分类率来定量评估方向性性能。这些错误分类行为被浓缩为一个数，即平均绝对误差（MAE），并且报告了方向性性能和非碰撞伽马通量之间的趋势。测量的MAE为8.2$°$ 使用113.4 $\mathrm{\mu }$Ci Cs-137来源和17.8$°$ 使用34.6 $\mathrm{\mu }$Ci Co-60放射源，两个放射源均放置在172.4厘米远处。最后，在具有移动源（MAE为12.7）的静态检测器阵列的情况下，演示了这种方向性算法$°$ 被观察到113 $\mathrm{\mu }$Ci Cs-137源的平均距离为350.0厘米。