Establishing a Strontium-90 Beta Reference Field in the Philippines for Protection-level Calibrations for Weakly Penetrating Radiations. - Grande, Marianna Lourdes Marie L.; Panlaqui, Angelo A.; Villacora, Ma. Eloisa V.; Amparado, Jhon Ray L.; Pineda, Camille U.; Dean, Kristine Marie Romallosa (Philippine Journal of Science, 2024)