Low dose ionizing radiation detection using conjugated polymers

Journal Article · Mon Mar 28 00:00:00 EST 2005 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.1891300· OSTI ID:20637038

Silva, E A.B.; Borin, J F; Nicolucci, P; Graeff, C F.O.; Netto, T Ghilardi; Bianchi, R F ^[1]

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1. Departamento de Fisica e Matematica, FFCLRP, Universidade de Sao Paulo, Av. Bandeirantes 3900, 14040-901 Ribeirao Preto, SP (Brazil)

In this work, the effect of gamma radiation on the optical properties of poly[2-methoxy-5-(2{sup '}-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV) is studied. The samples were irradiated at room temperature with different doses from 0 Gy to 152 Gy using a {sup 60}Co gamma ray source. For thin films, significant changes in the UV-visible spectra were only observed at high doses (>1 kGy). In solution, shifts in absorption peaks are observed at low doses (<10 Gy), linearly dependent on dose. The shifts are explained by conjugation reduction, and possible causes are discussed. Our results indicate that MEH-PPV solution can be used as a dosimeter adequate for medical applications.

• OSTI ID: 20637038
• Journal Information: Applied Physics Letters, Vol. 86, Issue 13; Other Information: DOI: 10.1063/1.1891300; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
COBALT 60
DOSEMETERS
GAMMA RADIATION
GAMMA SOURCES
IRRADIATION
OPTICAL PROPERTIES
ORGANIC SEMICONDUCTORS
POLYMERS
SOLUTIONS
TEMPERATURE RANGE 0273-0400 K
THIN FILMS
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA