Characteristics of PB2+ doped CsI matrix under gamma and neutron excitations
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2021
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Engenharias: da genialidade à profissão e seu desenvolvimento 2
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Resumo
In recent years, there has been an
increasing interest in finding new fast scintillating
material or improve the characteristics of known
scintillatorsfor the demand of high energy physics,
industrial and nuclear medical applications.
Divalent lead ions Pb2+ built in some crystal structures are efficient emission centers and
their applications in scintillators wereand arestill
the reason of an intensive study of emission
properties of different compounds containing
these ions. In this context, the crystals of Pb2+
doped CsI matrix were grown by the vertical
Bridgman techniqueandsubjected to annealing in
vacuum of 10-6 mbar and constanttemperatureof
350°C, for 24 hours, and then they were
employed. To evaluate the response of the
CsI:Pb scintillator crystal to gamma radiation,
radioactive sources of 137Cs (662 keV), 60Co
(1173 keV and 1333 keV), 22Na (511 keV and
1275 keV) and 133Ba (355 keV) wereused. The
operating voltage of the photomultiplier was
2700 V for the detection of gamma rays and
the accumulation time in the counting process
was 600 s. The scintillator response to neutron
radiation from a radioactive source of AmBe with
energy range of 1 to 12 MeV was available. The
activity of the AmBe source was 1 Ci Am. The
emission ratewas 2.2x 106 neutrons/ second. The
operating voltage of the photomultiplier tube was
1300 V. The accumulation time in the counting
process was 600 s. With the results obtained, it
may be observed that the crystals are sensitive to
these radiations.
Como referenciar
PEREIRA, MARIA da C.C.; MADI FILHO, TUFIC; BERRETTA, JOSE R.; TOMAZ, LUCAS F. Characteristics of PB2+ doped CsI matrix under gamma and neutron excitations. In: HOLZMANN, HENRIQUE A. (org.); DALLAMUTA, JOAO (org.). Engenharias: da genialidade à profissão e seu desenvolvimento 2. Ponta Grossa, PR: Atena Editora, 2021. , cap. 11. DOI: 10.22533/at.ed.246211811. Disponível em: http://repositorio.ipen.br/handle/123456789/32600. Acesso em: 19 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.