RESUMEN
The half-lives of 123Xe and 125Xe are important to diagnose deuterium-tritium (DT) fuel areal density in inertial confinement fusion (ICF). In this work, those two half-lives have been measured with HPGe γ-ray spectrometers using the reference source method. Data have been recorded over seven half-lives with three independent measurements for 123Xe and two for 125Xe. New values of 123Xe (2.040 ± 0.009) h and 125Xe (17.048 ± 0.032) h have been determined with significant reduction of the uncertainty compared to the currently recommended value of (2.08 ± 0.02) and (16.9 ± 0.2) h, respectively.
RESUMEN
Samples of 88Rb were produced by the irradiation of U3O8. A series of procedures were applied to extract pure radioactive solution of 88Rb. Experimental data was recorded by a 4πßγ-coincidence measurement system. Two rounds of experiments were performed to obtain four sets of measurement data. The measured half-life of 88Rb obtained from the average of the 4πß and 4πßγ-coincidence methods was 17.78 ± 0.05 min, in good agreement with previously reported values but with a significantly reduced uncertainty.
RESUMEN
Samples of 77Kr were produced by (n, 2n) reaction with a DT accelerator, the decay of 77Kr has been tracked by the reference source method with three High-Purity Germanium (HPGe) detectors. Experimental data were recorded at regular time intervals during measurements covering more than 600â¯min. The determined half-life of 77Kr is 71.25 (42) min, which indicated that the most recent values reported in the 1970s and the value recommended by Evaluated Nuclear Structure Data File (ENSDF) may be biased.
RESUMEN
Compton imaging is a promising technology for various applications including nuclear safety, nuclear medicine, and astrophysics. For quasi-point-source applications, which are widely found in practice, a novel Compton imaging algorithm incorporating the concept of self-adaption is proposed that provides excellent precision and high efficiency. In particular, this algorithm significantly improves the imaging precision of backward-scattering imaging events so that they can be revived for reconstruction without degrading image quality. From Monte Carlo simulations, a comparison between the self-adaption Compton imaging algorithm and the conventional Compton imaging algorithm was conducted, and the feasibility and reliability of this algorithm was verified in various scenarios.
RESUMEN
In the field of nuclear medicine, nuclear security and astrophysics, Compton imaging is a promising technique for gamma-ray source imaging. We are developing a Compton imager using two layers of CdZnTe pixel array detectors. In this paper, the backward-scattering effect within such imagers is numerically studied using Geant4 Monte Carlo Package. From images reconstructed based on forward-scattering and backward-scattering imaging events, the imaging precision was investigated in a comparative analysis, in regard to energy resolution and position resolution. Furthermore, to establish a method to use backward-scattering imaging events properly so that the imaging efficiency can be significantly improved, the difference between reconstruction from forward-scattering and backward-scattering imaging events was analyzed to uncover a causal mechanism.