A Strategy for selecting additional observation points when estimating radiation source distribution using LASSO regression

Yamada, Susumu  ; Machida, Masahiko  

Estimating the distribution of radiation sources is crucial for the safe decommissioning of reactor buildings. LASSO regression has been applied to estimate radiation sources inside reactor buildings based on radiation measurements. However, LASSO regression requires air dose rates measured at appropriate points to produce accurate estimates. Although a strategy for adding observation points has been proposed, its effectiveness is limited depending on the model size. Therefore, we propose a new strategy that takes into account the estimated source distribution and demonstrate its effectiveness.