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Updated: Sep 18, 2025

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Characterization of a system with a 241Am-Be neutron source moderated by lead for evaluating parameters of a 252Cf
Angela Souza Gonçalves1, Lunia Coelho de Almeida de Lima1, Antonio Carlos Ferreira1
1Instituto de Radioproteção e Dosimetria, IRD, Av. Salvador Allende, 3773, Barra da Tijuca, Rio de Janeiro, RJ, 22780-160, Brazil.
Abstract:
After the 2021 revision of ISO 8529-1, discontinuation left only 252Cf and 241Am-Be as standard reference fields. Currently, the cost of 1 g of 252Cf is approximately 27 million dollars, rendering it prohibitively expensive for widespread use compared to 241Am-Be, which is readily available, cost-effective, and has a long half-life. This work describes the development of a system utilizing a241Am-Be neutron source moderated within a lead cylinder to simulate the characteristics of a252Cf field. This new setup will be instrumental for sample testing, calibrations, and irradiations required by the laboratory's demands.
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