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論文

Development of a correction method for the time-of-flight prompt $$gamma$$-ray analysis

Huang, M.; 藤 暢輔; 海老原 充*; 木村 敦; 中村 詔司

Journal of Applied Physics, 121(10), p.104901_1 - 104901_7, 2017/03

 パーセンタイル:100(Physics, Applied)

A new analytical technique, time-of-flight prompt $$gamma$$-ray analysis, has been developed at the Japan Proton Accelerator Research Complex. In order to apply it to accurate elemental analysis, a set of standard Fe and Au samples were measured to examine the factors which affect the number of detected events. It was found that the main contributing factors included the attenuations of neutrons and $$gamma$$ rays in the sample, live-time ratio of the data acquisition system and signal pile-up correction factor. A simulation model was built for the estimations of neutron and $$gamma$$-ray attenuations. A simple empirical formula was proposed to calculate the signal pile-up correction factor. The whole correction method has proven to be accurate and reliable.

口頭

Development of correction methods for time-of-flight prompt $$gamma$$-ray analysis at ANNRI

Huang, M.; 藤 暢輔; 海老原 充*; 木村 敦; 中村 詔司

no journal, , 

The Accurate Neutron-Nucleus Reaction measurement Instrument has been available for time-of-flight (TOF) prompt $$gamma$$-ray analysis. However, the specific relationship between the number of detected events and the sample weight is not entirely clear. In this study, a set of standard Fe and Ag samples were measured to investigate the factors which affect the $$gamma$$ counts and TOF counts. It is found that live time of acquisition ($$tau$$), data acquisition efficiency in live time ($$delta$$), neutron attenuation (NA) and $$gamma$$-ray attenuation (GA) are the main contributing factors. An empirical formula is proposed for the calibration of $$delta$$. Simulation models are built for the evaluations of NA and GA by the PHITS program. The values of corrected $$gamma$$ and TOF counts are simply proportional to the sample weight. An accuracy of typically 5% has been achieved for the corrected result of a standard sample. It is sufficient for quantitative analysis.

口頭

Development of correction methods for the time-of-flight prompt $$gamma$$-ray analysis at ANNRI

Huang, M.; 藤 暢輔; 海老原 充*; 木村 敦; 中村 詔司

no journal, , 

The J-PARC Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI) has been available for the time-of-flight (TOF) prompt $$gamma$$-ray analysis. However, it is not entirely clear on the specific relationship between the number of detected events and the sample weight. In this study, a set of standard Fe and Ag samples were measured to examine the factors which affect the $$gamma$$ counts and TOF counts. It is found that the main contributing factors are live-time ratio of the data acquisition system ($$tau$$), data acquisition efficiency during the live time ($$delta$$), neutron attenuation (NA) and $$gamma$$-ray attenuation (GA). A 5.3-kHz random-pulse generator is used for the determination of $$tau$$. $$delta$$ is calibrated with an empirical formula. Simulation models are built for the evaluations of NA and GA by the PHITS program. With the present method, the values of corrected $$gamma$$ counts are accurately proportional to the sample weights.

口頭

Determination of chemical composition of nickel-based super alloy by TOF-PGA technique

Huang, M.; 藤 暢輔; 海老原 充*; 木村 敦; 中村 詔司

no journal, , 

Nickel-based super alloys are found in a wide range of applications, such as the manufacture of gas turbine military aircraft, power generation and marine propulsion. These kinds of alloys generally have complicated chemical compositions. In many studies, their compositions were determined by X-ray fluorescence (XRF) method since the alloys were not destroyed before testing their properties. However, XRF cannot detect the deep layer of alloys (typically under 0.1-mm depth). Therefore, thick alloys are hardly examined directly by XRF. Prompt gamma-ray analysis (PGA) and neutron resonance capture analysis (NCRA) are well-known non-destructive methods which are applicable to thick samples. Unfortunately, PGA is not very sensitive to some elements (e.g. Nb) and NCRA lacks of sensitivity to some light elements. At J-PARC ANNRI, the two methods have been combined as a new analytical method, TOF-PGA, which overcomes the disadvantages of PGA and NCRA. It is feasible to apply the new method to the examinations on materials with complicated chemical compositions. In this study, concentrations of Ni, Cr, Ti, Co, Al, B in two nickel-based super alloys were determined by PGA while W, Ta, Mo, Nb, Re, Ru and Hf were quantitatively analyzed by TOF analysis or TOF-PGA. The accurate results of present study show that the TOF-PGA technique is a powerful tool for the composition analysis on super alloys.

口頭

Development of correction methods for the time-of-flight prompt $$gamma$$-ray analysis at ANNRI

Huang, M.; 藤 暢輔; 海老原 充*; 木村 敦; 中村 詔司

no journal, , 

Prompt Gamma-ray Analysis (PGA) and neutron resonance capture analysis (NRCA) are well-known non-destructive methods for elemental determination. Their sensitivities and resolutions highly depend on elements. At J-PARC ANNRI, the two methods have been combined as a new analytical method, TOF-PGA. PGA, TOF and TOF-PGA spectra can be obtained simultaneously. Each element can be analyzed by the most suitable spectrum. However, the relationship between the number of detected events and the sample weight is not clear. In this study, a set of standard Fe, Ag and Au samples were measured to examine the factors which affect the $$gamma$$-ray counts and TOF counts. It is found that the main contributing factors are live-time ratio of the data acquisition system ($$tau$$), signal pile-up correction factor ($$delta$$), neutron attenuation (NA) and $$gamma$$-ray attenuation (GA). In this study, a 5.3-kHz random-pulse generator was used for the determination of $$tau$$. $$delta$$ was calculated by an empirical formula which was calibrated with the PGA data of 5 g Fe. Simulation models were built for the evaluations of NA and GA by the PHITS program. The correction method was validated and used for the determination of chemical compositions of nickel-based super alloys.

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