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14 results on '"Matuchova, M."'

6. Comparison of La[Br.sub.3] : Ce and La[Cl.sub.3] : Ce with NaI(T1) and Cadmium Zinc Telluride (CZT) detectors

Author

Alexiev, D., Mo, L., Prokopovich, D.A., Smith, M.L., and Matuchova, M.

Subjects
Gamma rays -- Spectra, Energy transformation -- Evaluation, Cerium -- Comparative analysis, Cerium -- Atomic properties, Zinc compounds -- Atomic properties, Zinc compounds -- Comparative analysis, Business, Electronics, Electronics and electrical industries
Abstract

Energy resolution and detection efficiency were compared between new scintillators, Lanthanum Bromide (La[Br.sub.3] : Ce) and Lanthanum Chloride (La[Cl.sub.3] : Ce) with conventional detectors, Sodium Iodide (NaI(T1) and Cadmium Zinc Telluride (CdZnTe or CZT). The study has shown that La[Br.sub.3] : Ce and La[Cl.sub.3] : Ce scintillator detectors provided by Saint-Gobain offer better resolution than NaI(TI) detector. La[Br.sub.3] : Ce and La[Cl.sub.3] : Ce detectors could resolve some closely spaced peaks from [sup.133]Ba and [sup.152]Eu, which Na(I) could not. La[Br.sub.3] : Ce has slightly better resolution and higher efficiency than La[Cl.sub.3] : Ce. An overall advantage of La[Br.sub.3] : Ce and La[Cl.sub.3] : Ce detectors over NaI(T1) and CZT has been discussed. The intrinsic activity of La[Br.sub.3] : Ce is also demonstrated in this study. Index Terms--CZT, efficiency, gamma spectral comparison, La[Br.sub.3] : Ce, La[Cl.sub.3] : Ce, NaI(T1), resolution.

Published
2008

8. X-ray laser-induced ablation of lead compounds

Author

Hajkova, V., Juha, L., Bohacek, P., Burian, T., Chalupsky, J., Vysin, L., Gaudin, J., Heimann, P. A., Hau-Riege, S. P., Jurek, M., Klinger, D., Pelka, J., Sobierajski, R., Krzywinski, J., Messerschmidt, M., Moeller, S. P., Nagler, B., Rowen, M., Schlotter, W. F., Swiggers, M. L., Turner, J. J., Vinko, S. M., Whitcher, T., Wark, J., Matuchova, M., Bajt, S., Chapman, H., Dzelzainis, T., Riley, D., Andreasson, J., Hajdu, J., Iwan, B., Timneanu, N., Saksl, K., Faeustlin, R., Singer, A., Tiedtke, K., Toleikis, S., Vartaniants, I., Wabnitz, H., Hajkova, V., Juha, L., Bohacek, P., Burian, T., Chalupsky, J., Vysin, L., Gaudin, J., Heimann, P. A., Hau-Riege, S. P., Jurek, M., Klinger, D., Pelka, J., Sobierajski, R., Krzywinski, J., Messerschmidt, M., Moeller, S. P., Nagler, B., Rowen, M., Schlotter, W. F., Swiggers, M. L., Turner, J. J., Vinko, S. M., Whitcher, T., Wark, J., Matuchova, M., Bajt, S., Chapman, H., Dzelzainis, T., Riley, D., Andreasson, J., Hajdu, J., Iwan, B., Timneanu, N., Saksl, K., Faeustlin, R., Singer, A., Tiedtke, K., Toleikis, S., Vartaniants, I., and Wabnitz, H.

Abstract

The recent commissioning of a X-ray free-electron laser triggered an extensive research in the area of X-ray ablation of high-Z, high-density materials. Such compounds should be used to shorten an effective attenuation length for obtaining clean ablation imprints required for the focused beam analysis. Compounds of lead (Z=82) represent the materials of first choice. In this contribution, single-shot ablation thresholds are reported for PbWO(4) and PbI(2) exposed to ultra-short pulses of extreme ultraviolet radiation and X-rays at FLASH and LCLS facilities, respectively. Interestingly, the threshold reaches only 0.11 J/cm(2) at 1.55 nm in lead tungstate although a value of 0.4 J/cm(2) is expected according to the wavelength dependence of an attenuation length and the threshold value determined in the XUV spectral region, i.e., 79 mJ/cm(2) at a FEL wavelength of 13.5 nm. Mechanisms of ablation processes are discussed to explain this discrepancy. Lead iodide shows at 1.55 nm significantly lower ablation threshold than tungstate although an attenuation length of the radiation is in both materials quite the same. Lower thermal and radiation stability of PbI(2) is responsible for this finding., Conference on Damage to VUV, EUV, and X-ray Optics III, Prague, CZECH REPUBLIC, APR 18-20, 2011

Published
2011
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13. Comparison of LaBr3 : Ce and LaCl3 : Ce With NaI(T1) and Cadmium Zinc Telluride (CZT) Detectors.

Author

Alexiev, D., Mo, L., Prokopovich, D. A., Smith, M. L., and Matuchova, M.

Subjects
ENERGY transfer, PHYSICS instruments, LANTHANUM, CHLORIDES, DETECTORS, SCINTILLATORS
Abstract

Energy resolution and detection efficiency were compared between new scintillators, Lanthanum Bromide (LaBr3 Ce) and Lanthanum Chloride (LaCl3 : Ce) with conventional detectors, Sodium Iodide (NaI(Tl) and Cadmium Zinc Telluride (CdZnTe or CZT). The study has shown that LaBr3 : Ce and LaCl3 : Ce scintillator detectors provided by Saint-Gobain offer better resolution than NaI(Tl) detector. LaBr3 : Ce and LaCl3 Ce detectors could resolve some closely spaced peaks from 133Ba and 152Eu, which Na(I) could not. LaBr3 Ce has slightly better resolution and higher efficiency than LaCl3 : Ce. An overall advantage of LaBr3 : Ce and LaCl3 : Ce detectors over NaI(Tl) and CZT has been discussed. The intrinsic activity of LaBr3 Ce is also demonstrated in this study. [ABSTRACT FROM AUTHOR]

Published
2008
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