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Titolo:
Positron irradiation effects on positronium formation in polycarbonates during a positron-annihilation experiment
Autore:
Suzuki, T; Kondo, K; Hamada, E; Ito, Y;
Indirizzi:
KEK, High Energy Accelerator Res Orgn, Tsukuba, Ibaraki 3050801, Japan KEK Tsukuba Ibaraki Japan 3050801 s Orgn, Tsukuba, Ibaraki 3050801, Japan Ibaraki Prefectural Univ Hlth Sci, Dept Radiol Sci, Ami, Ibaraki 3000394, Japan Ibaraki Prefectural Univ Hlth Sci Ami Ibaraki Japan 3000394 000394, Japan Univ Tokyo, Nucl Sci & Technol Res Ctr, Tokai, Ibaraki 3191106, Japan UnivTokyo Tokai Ibaraki Japan 3191106 Ctr, Tokai, Ibaraki 3191106, Japan
Titolo Testata:
ACTA PHYSICA POLONICA A
fascicolo: 3-4, volume: 99, anno: 2001,
pagine: 515 - 521
SICI:
0587-4246(200103/04)99:3-4<515:PIEOPF>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOW-TEMPERATURE; POLYETHYLENE; POLYPROPYLENE; TRANSITIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Suzuki, T KEK, High Energy Accelerator Res Orgn, Tsukuba, Ibaraki 3050801,Japan KEK Tsukuba Ibaraki Japan 3050801 ukuba, Ibaraki 3050801, Japan
Citazione:
T. Suzuki et al., "Positron irradiation effects on positronium formation in polycarbonates during a positron-annihilation experiment", ACT PHY P A, 99(3-4), 2001, pp. 515-521

Abstract

The positron-irradiation effect on polycarbonate during a positron annihilation lifetime spectroscopy experiment was investigated using different intensities of Na-22 positron sources and gamma -irradiated samples. The decrease in I-3 was larger for a larger intensity of positron sources. In the case of a weak source (approximate to 140 kBq), I-3 did not change with the elapsed time for non-irradiated samples. However, for 1 MGy irradiated samples, I-3 measured with the weak source increased with the elapsed time. Thiscan be attributed to a decrease in the radicals induced in the irradiated samples by gamma -irradiation. In order to explain the change in I-3 measured at room and liquid-nitrogen temperatures, several effects, such as radicals, cross-linking, structure change, and charging, need to be considered. Also, it is difficult to explain the change in I-3 using only one of these effects.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 04:08:26