Poster Congreso Imrs 2009 Cancun, Def. 1, Formato Viejo
1
ZnS ZnO:Cu-1 ZnO ZnO:Cu-2 ZnO:Cu-2 ZnO:Cu-3 TQ + Anneali ng TQ Anneali ng Figure 4. Integrated TL as a function of dose, of differents ZnO:Cu obtained , compared with ZnO. Figure 5. Integrated TL as a function of dose, of a ZnO:Cu-3 pellet for doses up to 2.56 kGy of beta radiation. The synthesis of new ZnO:Cu phosphors was carried out by three different processes. The materials obtained by these processes were named ZnO:Cu-1, ZnO:Cu-2 and ZnO:Cu-3 respectively. In process 1, ZnS powder was chemically modified by a reaction with a stable copper complex, ([Cu(en) 2 ](ClO 4 ) 2 ), during 30 minutes which resulted in a Greenish colored powder. The modified ZnS was sintered in air at 700 °C for 24 h. The material obtained in this way was denominated ZnO:Cu-1. In process 2, ZnO powder was chemically modified in the same way as the ZnS in process 1 resulting in the material denominated ZnO:Cu-2. Subsequent sintering in air at 700 °C for 24 h of material ZnO:Cu-2 resulted in the material denominated ZnO:Cu-3. Síntesis de Nuevos Fósforos útiles para detección y dosimetría de radiaciones C. Cruz-Vázquez 1 , S. E. Burruel-Ibarra 1 , R. Bernal 2 , H. Grijalva-Monteverde 1 , F. Brown 1 , V. M. Castaño 3 1 Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, 2 Departamento de Investigación en Física, Universidad de Sonora,, 3 Departamento de Física Aplicada y Tecnología Avanzada, Instituto de Física de la Universidad Nacional Autónoma de México, ZnO:Cu-2 Powder } Annealing 700°C 24 h in air ZnO:Cu-1 Powder TQ Cu(en) 2 (ClO 4 ) 2 ZnO:Cu-2 Powder ZnO:Cu-3 Powder Annealing 700°C 24 h in air ZnS Powder TQ Cu(en)2(ClO4)2 Process 1 Process 2 Process 3 Annealing 700°C 24 h in air ZnS Powder Synthesis of ZnS powder for CBD 10 20 30 40 50 60 70 2 (g rad e) (a) (b ) (d ) (c) (a) Z nO (b).Z nO :C u-1 (c) Z nO :C u-2 (d) Z nO :C u-3 Figure 1. X-ray patterns of ZnO, ZnO:Cu-1, ZnO:Cu-2 and ZnO:Cu-3 powders. The vertical lines correspond to ZnO, zincite (ICDD, No. 36-1451). 100 1000 10 7 10 8 IT L (a rb . u .) D ose (G y) ZnO ,m = 0.80356 ZnO C u-1,m = 0.91518 ZnO C u-2,m = 0.86597 ZnO C u-3,m = 1.10926 10 100 1000 10 5 10 6 10 7 10 8 E xperim ental F itlinear IT L (arb.u.) D ose (G y) S lope:1.0983 R :0.99953 ZnO :C u -3 P ellet Figure 2. Scanning electron microscopy (SEM) image of different ZnO:Cu pellets. 50 100 150 200 250 300 350 400 450 0 1x10 5 2x10 5 3x10 5 4x10 5 5x10 5 6x10 5 7x10 5 8x10 5 x 3 T L Intensity (arb.u.) T em p e ra tu re (°C ) ZnO ZnO :Cu-1 ZnO :Cu-2 ZnO :Cu-3 x 3 The ZnO:Cu-1, ZnO:Cu-2 and ZnO:Cu-3 powders display very similar XRD patterns. Most intense diffraction peaks of the samples coincide with the XRD pattern of hexagonal ZnO (zincite, ICDD, # 36-1451). The copper presence was confirmed by an elementary analysis obtained by energy dispersive X ray spectroscopy (EDS). The elementary analysis obtained by EDS carried out on different ZnO:Cu powders approximately revealed a composition of 96% of Zn, 3% of Cu, and 1% of S. Figure 3. TL glow curves of ZnO:Cu phosphors exposure to 2.56 kGy dose of beta radiation, compared with ZnO irradiated with 3 kGy dose. The ZnO:Cu-3 displays a more linear dose response. The slope in logarithmic scale of the TL as a function of dose for the ZnO:Cu-3 is 1.1, that is within the tolerance for supposed linear response. Between the three doped copper phosphors, the ZnO:Cu- 3 presents a sensitivity three times greater than the other two, besides being the one that exhibits less fading of TL during storing after irradiation. None of the materials showed a tendency of saturation within the dose range used. [email protected]. mx E- mail: Diagram 1.
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Transcript of Poster Congreso Imrs 2009 Cancun, Def. 1, Formato Viejo
ZnS ZnO:Cu-1
ZnO ZnO:Cu-2
ZnO:Cu-2 ZnO:Cu-3
TQ + Annealing
TQ
Annealing
Figure 4. Integrated TL as a function of dose, of differents ZnO:Cu obtained , compared with ZnO.
Figure 5. Integrated TL as a function of dose, of a ZnO:Cu-3 pellet for doses up to 2.56 kGy of beta radiation.
The synthesis of new ZnO:Cu phosphors was carried out by three different processes. The materials obtained by these processes were named ZnO:Cu-1, ZnO:Cu-2 and ZnO:Cu-3 respectively. In process 1, ZnS powder was chemically modified by a reaction with a stable copper complex, ([Cu(en)2](ClO4)2), during 30 minutes which resulted in a Greenish colored powder. The modified ZnS was sintered in air at 700 °C for 24 h. The material obtained in this way was denominated ZnO:Cu-1. In process 2, ZnO powder was chemically modified in the same way as the ZnS in process 1 resulting in the material denominated ZnO:Cu-2. Subsequent sintering in air at 700 °C for 24 h of material ZnO:Cu-2 resulted in the material denominated ZnO:Cu-3.
Síntesis de Nuevos Fósforos útiles para
detección y dosimetría de radiaciones
C. Cruz-Vázquez1, S. E. Burruel-Ibarra1, R. Bernal2, H. Grijalva-Monteverde1, F. Brown1, V. M. Castaño3
1 Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, 2 Departamento de Investigación en Física, Universidad de Sonora,, 3Departamento de Física Aplicada y Tecnología Avanzada, Instituto de Física de la Universidad Nacional Autónoma de México,
ZnO:Cu-2 Powder
}Annealing
700°C 24 h in air
ZnO:Cu-1Powder
TQCu(en)2(ClO4)2
ZnO:Cu-2Powder
ZnO:Cu-3Powder
Annealing700°C
24 h in air
ZnS Powder
TQ Cu(en)2(ClO4)2
Process 1 Process 2 Process 3
Annealing700°C
24 h in air
ZnS Powder
Synthesis of ZnS powder for CBD
10 20 30 40 50 60 70
2 (grade)
(a)
(b)
(d)
(c)
(a) ZnO(b). ZnO:Cu-1(c) ZnO:Cu-2(d) ZnO:Cu-3
Figure 1. X-ray patterns of ZnO, ZnO:Cu-1, ZnO:Cu-2 and ZnO:Cu-3 powders. The vertical lines correspond to ZnO, zincite (ICDD, No. 36-1451).
100 1000
107
108
ITL
(arb
. u.)
Dose (Gy)
ZnO, m= 0.80356 ZnOCu-1, m= 0.91518 ZnOCu-2, m= 0.86597 ZnOCu-3, m= 1.10926
10 100 1000105
106
107
108
Experimental Fit linear
ITL
(arb
. u.)
Dose (Gy)
Slope: 1.0983R: 0.99953
ZnO:Cu-3 Pellet
Figure 2. Scanning electron microscopy (SEM) image of different ZnO:Cu pellets.
50 100 150 200 250 300 350 400 4500
1x105
2x105
3x105
4x105
5x105
6x105
7x105
8x105
x 3
TL In
tens
ity (a
rb. u
.)Temperature (°C)
ZnO ZnO:Cu-1 ZnO:Cu-2 ZnO:Cu-3
x 3
The ZnO:Cu-1, ZnO:Cu-2 and ZnO:Cu-3 powders display very similar XRD patterns. Most intense diffraction peaks of the samples coincide with the XRD pattern of hexagonal ZnO (zincite, ICDD, # 36-1451). The copper presence was confirmed by an elementary analysis obtained by energy dispersive X ray spectroscopy (EDS). The elementary analysis obtained by EDS carried out on different ZnO:Cu powders approximately revealed a composition of 96% of Zn, 3% of Cu, and 1% of S.
Figure 3. TL glow curves of ZnO:Cu phosphors exposure to 2.56 kGy dose of beta radiation, compared with ZnO irradiated with 3 kGy dose.
The ZnO:Cu-3 displays a more linear dose response. The slope in logarithmic scale of the TL as a function of dose for the ZnO:Cu-3 is 1.1, that is within the tolerance for supposed linear response. Between the three doped copper phosphors, the ZnO:Cu-3 presents a sensitivity three times greater than the other two, besides being the one that exhibits less fading of TL during storing after irradiation. None of the materials showed a tendency of saturation within the dose range used.
[email protected] E-mail:
Diagram 1.
