A detailed experimental investigation of the low energy electron spectrum generated in the EC-decay of 6731Ga

Kovalı́k, A.; Lubashevsky, A.V.; Inoyatov, A. Kh.; Filosofov, D.V.; Korolev, Nikolay; Gorozhankin, V.M.; Vylov, Ts.; Štekl, I.

doi:10.1016/j.elspec.2003.09.008

Cited by 11 publications

(24 citation statements)

References 29 publications

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“…Experimental spectra of low-energy AE and CK electrons (< 1200 eV) from radioactive decays are extremely scarce in the literature. One such energy spectrum (Kovalík et al, 2004) is highly distorted thus useful comparisons could not be made.…”

Section: Discussionmentioning

confidence: 99%

“…Experimental spectra of low-energy AE and CK electrons (<1200 eV) from radioactive decays are extremely scarce in the literature. One such energy spectrum (Kovalík et al 2004) is highly distorted thus useful comparisons could not be made. Future measurements of low-energy electrons with cleaner background are desired for more detailed comparison between theory and experiment.…”

Section: Discussionmentioning

confidence: 99%

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Absorbed dose evaluation of Auger electron-emitting radionuclides: impact of input decay spectra on dose point kernels and S-values

et al. 2017

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The aim of this study was to investigate the impact of decay data provided by the newly developed stochastic atomic relaxation model BrIccEmis on dose point kernels (DPKs - radial dose distribution around a unit point source) and S-values (absorbed dose per unit cumulated activity) of 14 Auger electron (AE) emitting radionuclides, namely Ga,Br, Zr,Nb, Tc,In, Sn,Sb, I,I, I,La, Pt andTl. Radiation spectra were based on the nuclear decay data from the medical internal radiation dose (MIRD) RADTABS program and the BrIccEmis code, assuming both an isolated-atom and condensed-phase approach. DPKs were simulated with the PENELOPE Monte Carlo (MC) code using event-by-event electron and photon transport. S-values for concentric spherical cells of various sizes were derived from these DPKs using appropriate geometric reduction factors. The number of Auger and Coster-Kronig (CK) electrons and x-ray photons released per nuclear decay (yield) from MIRD-RADTABS were consistently higher than those calculated using BrIccEmis. DPKs for the electron spectra from BrIccEmis were considerably different from MIRD-RADTABS in the first few hundred nanometres from a point source where most of the Auger electrons are stopped. S-values were, however, not significantly impacted as the differences in DPKs in the sub-micrometre dimension were quickly diminished in larger dimensions. Overestimation in the total AE energy output by MIRD-RADTABS leads to higher predicted energy deposition by AE emitting radionuclides, especially in the immediate vicinity of the decaying radionuclides. This should be taken into account when MIRD-RADTABS data are used to simulate biological damage at nanoscale dimensions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Absorbed dose evaluation of Auger electron-emitting radionuclides: impact of input decay spectra on dose point kernels and S-values

et al. 2017

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“…A mismatch occurs, however, about the number of peaks: our spectrum computed with CBF-CCSD decay widths comprises 5 distinct peaks, whereas 9 peaks were observed experimentally. 76 This mismatch disappears when using MCDHF decay widths, which illustrates the impact of relativistic effects on Auger intensities.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

Ab Initio Computation of Auger Decay in Heavy Metals: Zinc about It

Ferino-Pérez,

Jagau

2024

J. Phys. Chem. A

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We report the first coupled-cluster study of Auger decay in heavy metals. The zinc atom is used as a case study due to its relevance to the Auger emission properties of the 67Ga radionuclide. Coupled-cluster theory combined with complex basis functions is used to describe the transient nature of the core-ionized zinc atom. We also introduce second-order Møller–Plesset perturbation theory as an alternative method for computing partial Auger decay widths. Scalar-relativistic effects are included in our approach for computing Auger electron energies by means of the spin-free exact two-component one-electron Hamiltonian, while spin–orbit coupling is treated by means of perturbation theory. We center our attention on the K-edge Auger decay of zinc dividing the spectrum into three parts (K-LL, K-LM, and K-MM) according to the shells involved in the decay. The computed Auger spectra are in good agreement with experimental results. The most intense peak is found at an Auger electron energy of 7432 eV, which corresponds to a 1D2 final state arising from K-L2L3 transitions. Our results highlight the importance of relativistic effects for describing Auger decay in heavier nuclei. Furthermore, the effect of a first solvation shell is studied by modeling Auger decay in the hexaaqua-zinc(II) complex. We find that K-edge Auger decay is slightly enhanced by the presence of the water molecules as compared to the bare atom.

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“…The spectrometer energy scale was calibrated using 17 low energy conversion electron lines (listed in parentheses). Twelve of them arise in internal conversion (IC) of nuclear transitions in 169 Tm (generated in the EC decay of 169 Yb (T 1/2 = 32.02 d)) with energies E γ = 8.410 17 (15) [41] (M 1,2 , N 1,3 ), 20.743 70 (16) [41] (L 1-3 , M 1-3 , N 1 ), and 63.120 44(3) keV [41] (K). Another five are connected with the 14.413 00 (15) keV [42] nuclear transition in 57 Fe (K, L 1-3 , M 1 ) produced in the EC decay of 57 Co (T 1/2 = 271.7 d).…”

Section: Measurements and Energy Calibrationmentioning

confidence: 99%

“…So far the KLM Auger spectra of only 12 different elements were measured in detail in the atomic number region 18 < Z < 45, namely for Z = 23 [8][9][10], 24 [9,10], 25 [10,11], 26 [10,12,13], 28 [14], 29 [15], 30 [16], 31 [8], 32 [17], 33 [18], 35 [19,20], and 36 [21].…”

Section: Introductionmentioning

confidence: 99%

The KLM + KLN Auger electron spectrum of rubidium in different matrices

Inoyatov¹,

Kovalı́k²,

Perevoshchikov³

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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The KLM + KLN Auger electron spectrum of rubidium (Z = 37) emitted in the electron capture decay of radioactive 83 Sr in a polycrystalline platinum matrix and also 85 Sr in polycrystalline platinum and carbon matrices as well as in an evaporated layer onto a carbon backing were experimentally studied in detail for the first time using a combined electrostatic electron spectrometer. Energies, relative intensities, and natural widths of fifteen basic spectrum components were determined and compared with both theoretical predictions and experimental data for krypton (Z = 36). Relative spectrum line energies obtained from the semi-empirical calculations in intermediate coupling scheme were found to agree within 3σ with the measured values while disagreement with experiment exceeding 3σ was often observed for values obtained from our multiconfiguration Dirac-Hartree-Fock calculations. The absolute energy of the dominant spectrum component given by the semi-empirical approach agrees within 1σ with the measured value. Shifts of +(0.2 ± 0.2) and −(1.9 ± 0.2) eV were measured for the dominant KLM spectrum components between the 85 Sr sources prepared by vacuum evaporation on and implanted into the carbon foil, respectively, relative to 85 Sr implanted into the platinum foil. A value of (713 ± 2) eV was determined for the energy difference of the dominant components of the KLM + KLN Auger electron spectra of rubidium and krypton generated in the polycrystalline platinum matrix. From the detailed analysis of the measured data and available theoretical results, the general conclusion can be drawn that the proper description of the KLM + KLN Auger electron spectrum for Z around 37 should still be based on the intermediate coupling of angular momenta taking into account relativistic effects.

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A detailed experimental investigation of the low energy electron spectrum generated in the EC-decay of 6731Ga

Cited by 11 publications

References 29 publications

Absorbed dose evaluation of Auger electron-emitting radionuclides: impact of input decay spectra on dose point kernels and S-values

Absorbed dose evaluation of Auger electron-emitting radionuclides: impact of input decay spectra on dose point kernels and S-values

Ab Initio Computation of Auger Decay in Heavy Metals: Zinc about It

The KLM + KLN Auger electron spectrum of rubidium in different matrices

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