Response of lead metaniobate acoustic emission sensors to gamma irradiation

Piezoelectric (PE) acoustic emission (AE) sensors were exposed to hundreds of kGy from Co-60 gamma rays. Recalibration of gamma-irradiated sensors showed a sensitivity decline of 8.4% per 100 kGy. Exposure of lead metaniobate disc specimens, the sensor ferroelectric material, to /spl sim/1 MGy revea...

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Veröffentlicht in:	IEEE transactions on nuclear science 2005-12, Vol.52 (6), p.2583-2590
Hauptverfasser:	Holbert, K.E., Sankaranarayanan, S., McCready, S.S.
Format:	Artikel
Sprache:	eng
Schlagworte:	Acoustic emission Acoustic sensors Capacitance Capacitive sensors Electric potential Ferroelectric materials Gamma radiation Gamma ray detectors Gamma rays Lead lead metaniobate Mechanical sensors Nuclear radiation Nuclear reactor components piezoelectric transducers Polyethylenes pulse reactor testing radiation effects Sensors Voltage
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Zusammenfassung:	Piezoelectric (PE) acoustic emission (AE) sensors were exposed to hundreds of kGy from Co-60 gamma rays. Recalibration of gamma-irradiated sensors showed a sensitivity decline of 8.4% per 100 kGy. Exposure of lead metaniobate disc specimens, the sensor ferroelectric material, to /spl sim/1 MGy revealed a capacitance increase and PE voltage (g/sub 33/) coefficient decrease with gamma dose. The planar coupling factor (k/sub p/) and mechanical quality factor (Q/sub m/) exhibited small reductions. The AE sensors were also subjected to nuclear radiation from a pulse reactor.
ISSN:	0018-9499 1558-1578
DOI:	10.1109/TNS.2005.860708