Calculated and experimental response of calcium silicate polycrystalline to high and very-high neutron doses

Autor(es)

Gonzales-Lorenzo, Carlos D. ^[1] ; Watanabe, Shigueo ^[1] ; Cavalieri, Tassio A. ^[2] ; Cano, Nilo F. ^[3] ; Rao, T. K. Gundu ^[1] ; Chubaci, Jose F. D. ^[1] ; Carmo, Lucas S. ^[2] ; Bueno, Carmen C. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Fis, Rua Matao, Travessa R 187, BR-05508090 Sao Paulo, SP - Brazil

^[2] IPEN CNEN SP, Inst Pesquisas Energet & Nucl, Av Prof Lineu Prestes 2242, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil

^[3] Univ Fed Sao Paulo, Inst Mar, Rua Doutor Carvalho Mendonca 144, BR-11070100 Santos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Radiation Physics and Chemistry; v. 172, JUL 2020.
• Citações Web of Science: 0

Resumo

In the scope to the discovery of new detectors for high and very-high gamma and neutron radiation dose (mGy-MGy), synthetic polycrystals of CaSiO3 have been produced by the devitrification method in our laboratory. CaSiO3 polycrystals were irradiated with thermal, epithermal and a small fraction of fast neutrons. In the position of irradiation, the thermal neutron flux is about 83% of the total neutron flux and the thermal neutron fluences range from 5.82 x 10 (13) to 2.97 x 10(16) n/cm(2). This thermal neutron reacts with Ca, Si and O through (n,gamma) process, all or part of the gamma emitted in this reaction is absorbed by the sample and is responsible for the induction of thermoluminescence (TL). The total energy emitted by the (n,gamma) reaction was calculated analytically. Furthermore, Monte Carlo simulations using MCNP5 radiation transport code was carried out to calculate the deposited dose on CaSiO3 by the neutron interaction finding doses ranging from 42 Gy to 21 kGy. CaSiO3 TL glow curves, after radiation exposure from the reactor, display the main prominent TL peak around 234-259 degrees C and when exposed to gamma radiation (Co-60) it shows the main TL peak around same 234-272 degrees C. (AU)

• Processo FAPESP: 14/03085-0 - Geocronologia do quaternário da costa Sudeste e Sul do Brasil
• Beneficiário: Shigueo Watanabe
• Modalidade de apoio: Auxílio à Pesquisa - Temático