An unfolding method for BSS (Bonner Sphere Spectrometer) measurement without using prior information

However, during some special circumstances, i. e. experimental validation of the deep penetration problem calculation method, the unfolding process needs to be independent of the prior information. [Purpose] This study aims to propose an unfolding method that is independent of the prior information and adaptive to the uncertainties and illness of the unfolding problems, which is essential to validate the computational method for deep-penetration.

[Methods] The iterative regularization unfolding method is based on Krylov subspace method. The Lanczos bidiagnolization was applied to calculate orthogonal basis of the Krylov subspaces, and the Tikhonov regularization was applied to suppress the uncertainties contained in the measured data. The regularization parameter was determined by the GCV (Generalized Cross Validation) principle.