Radiochromic properties of alpha-terthiophene-cellulose triacetate films

Authors
Emmi, SS Ceroni, P Lavalle, M Fuochi, PG D'Angelantonio, M Alberti, A Macciantelli, D Kovacs, A Takacs, E
Citation
Ss. Emmi et al., Radiochromic properties of alpha-terthiophene-cellulose triacetate films, RADIAT PH C, 57(3-6), 2000, pp. 707-710
Citations number
9
Categorie Soggetti
Physics
Journal title
RADIATION PHYSICS AND CHEMISTRY
ISSN journal
0969806X → ACNP
Volume
57
Issue
3-6
Year of publication
2000
Pages
707 - 710
Database
ISI
SICI code
0969-806X(200003)57:3-6<707:RPOATF>2.0.ZU;2-H
Abstract
An alpha-terthiophene/cellulose triacetate film system exposed to gamma-ray s and electron beam shows two new bands in the visible region of the spectr um. The absorbance at 490 nm is almost stable for a long time and responds linearly to the dose applied up to 400 kGy. A Second band developed at 700 nm depends on dose rate and may indicate a chain-growth. The main species r esponsible for the color change and EPR signal is likely to be an enlarged oligomer radical cation stabilized by a semiquinoid structure. (C) 2000 Els evier Science Ltd. All rights reserved.