Response of CsI:Pb scintillator crystal to neutron radiation
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2023
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BRAZIL MRS MEETING, 21st
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Resumo
The helium-3 world crisis requires a development of new methods of neutron detection to
replace commonly used 3He proportional counters. In the past decades, great effort was
made to developed efficient and fast scintillators to detect radiation.[1] These detectors
should, then, be carefully characterized both experimentally and by means of advanced
simulation code. Ideally, the detector should have the capability to separate neutron and
gamma induced events either by amplitude or through pulse shape differences. As neutron
sources also generate gamma radiation, which can interfere with the measurement, it is
necessary that the detector be able to discriminate the presence of such radiation.
Considerable progress has been achieved to develop new inorganic scintillators, in
particular increasing the light output and decreasing the decay time by optimized doping.
Crystals may be found to suit neutron detection. In this report, we will present the results of
the study of lead doped cesium iodide crystals (CsI:Pb) grown in our laboratory, using the
vertical Bridgman technique. The concentration of the lead doping element (Pb) was studied
in the range 5x10-4M to 10-2M. The crystals grown were subjected to annealing (heat
treatment). In this procedure, vacuum of 10-6 mbar and continuous temperature of 350°C,
for 24 hours, were employed. In response to neutron radiation, an AmBe source with energy
range of 1 MeV to 12 MeV was used. The activity of the AmBe source was 1Ci Am. The
fluency was 2.6 x 106 neutrons/second. The operating voltage of the photomultiplier tube was
1300 V; the accumulation time in the counting process was 600 s and 1800 s. The
scintillator crystals used were cut with dimensions of 20 mm diameter and 10 mm height.
The Monte Carlo method was used to determine the neutron flux arriving in the detector
and the calculated values were obtained by means of MCNP code.
Como referenciar
PEREIRA, MARIA da C.C.; MADI FILHO, TUFIC; BERRETTA, JOSE R.; ALVES, JOAO P. da S. Response of CsI:Pb scintillator crystal to neutron radiation. In: BRAZIL MRS MEETING, 21st, October 1-5, 2023, Maceió, AL. Abstract... São Carlos, SP: Aptor Software, 2023. p. 1014-1014. Disponível em: http://repositorio.ipen.br/handle/123456789/34551. Acesso em: 20 Mar 2026.
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.