Chemical etching studies of a Brazilian polycarbonate to fast neutron detection
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2006
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PRIMER CONGRESO AMERICANO DEL IRPA 2006; REUNION ANUAL DE LA SMSR, 24. Y CONGRESO ANUAL DE LA SNM, 17.
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The Dosimetric Materials Laboratory (LMD) of the Radiation Metrology Center (CMR)
is developing a personal dosimeter for fast neutrons using the technique of solid state
nuclear track detectors (SSNTD). This technique is based on the recorded damage (tracks)
in dielectric materials due to the impact of charged particles. The tracks are revealed and
amplified for visualization in optic microscope through a technique known as chemical
etching. The LMD is investigating a Brazilian commercial polycarbonate as a new passive
fast neutron’s detector in substitution to the traditional materials, as the cellulose nitrate
LR-115 and the polycarbonates Makrofol and CR-39. The variation of the etching
parameters (chemical solution, time and temperature) alters the response of the material;
the best revelation conditions provide the best relationship among the amount of revealed
tracks, their clearness and the time spent for this. The polycarbonate studied is a resin of
same chemical monomer of Makrofol (C16H14O3). Samples of 3 x 1 cm
2
of the
polycarbonate were irradiated with 5 mSv of fast neutrons (
241Am-Be) and revealed with
the chemical solution PEW-40 (15% KOH, 45% H2O, 40% C2H5OH), commonly used for
Makrofol. The studied etching parameters were time and temperature. Groups of four
samples were revealed at temperatures of 50, 65, 75, 90 and 100oC with etching times
varying from one to six hours. The used track’s counting procedure was that referred in
the literature. The best response to fast neutrons was obtained at 75oC; in spite of their
similar answers, smaller temperatures join larger uncertainties in the track’s counting and
poorer clearness. At this temperature, the number of revealed tracks increases with the
etching time approximately until a plateau at three hours. For etching times higher than
four hours the polycarbonate presents overlap of tracks. If the temperature is adjusted to
75oC, the etching time should be in the plateau to avoid that small time errors alter
significantly the counting of tracks. On the other hand, besides the tracks overlapping that
implies in tracks counting errors, sensitivity curve plateau is reached for a higher elapsed
time compared to the working day of a dosimetry laboratory.
Como referenciar
SOUTO, E.B.; CAMPOS, L.L. Chemical etching studies of a Brazilian polycarbonate to fast neutron detection. In: PRIMER CONGRESO AMERICANO DEL IRPA 2006; REUNION ANUAL DE LA SMSR, 24. Y CONGRESO ANUAL DE LA SNM, 17., September 3-8, 2006, Acapulco, Mexico. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/13754. Acesso em: 24 Mar 2026.
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