[2B10-15] Decommissioning of Fukushima Daiichi NPP 3

[2B12] Development of Exposure Reduction Technologies by Digitalization of Environment and Radioactive Source Distribution

(3) LASSO Theory and Demonstration for Inverse Estimation on Radioactive Source Distributions

*Wei Shi¹, Masahiko Machida², Susumu Yamada², Toru Yoshida³, Yukihiro Hasegawa³, Koji Okamoto^1,2 (1. UTokyo, 2. JAEA, 3. RIST)

Keywords:Inverse Estimation on Radioactive Source Distributions, Air Dose Rate Measurement, Least Absolute Shrinkage and Selection Operator, Monte Carlo Simulation for Gamma Ray

A mathematical criterion on the number of monitoring points to correctly predict source distributions based on LASSO theory is developed for ill-posed radioactive source reconstruction. We employ Monte Carlo simulation to demonstrate and verify the feasibility of LASSO. Moreover, an influence factor like detector-source distance to enhance the predicting possibility in the inverse estimation is also examined.