1 Decay Scheme Am-241 decays 100% by alpha transitions to Np-237. Most of the decay (84.6 %) populate the excited level of Np-237 with energy of 59.54 keV. Branching of Am-241 decay by spontaneous ﬁssion is 3,6 (9) E-10 %. L’am´ericium 241 se d´esint`egre a 100 % par ´emission alpha vers le neptunium 237. Le branchement principal

Nuclei which decay by positron emission may also decay by electron capture. For low-energy decays, electron capture is energetically favored by 2m e c 2 = 1.022 MeV, since the final state has an electron removed rather than a positron added. As the energy of the decay goes up, so does the branching fraction of positron emission.

Half-Life. Percent Yield per decay . 8. Er-169.

0.3. 22. Sm-151. 87 years.

. . .

From the decay scheme we see that in 99.88 % of the decays an electron (β-particle) of E = 0.31 MeV is emitted followed by two gamma rays of energies Eγ1 = 1.17 MeV and Eγ2 = 1.33 MeV. The radioactive isotope Na-22 decays through β+ emission. Figure 10.2 shows the decay scheme of Na-22. Figure 10.2. Decay scheme of Na-22.

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0 500 1000 1500 10−1 100 101 102 103 X: 340 Y: 21.8 X: 1068 Y: 3.4 Sodium−22 Gamma Ray Spectrum Calibrated Energy (keV) Counts (LogN) Na−22 Peak 1: Electron

Sodium−22 Gamma Ray Spectrum. Calibrated Energy (keV). Counts (LogN) . 11-Na-22 [ Intensities before May 23th of 2013 were values when total intensity of the decay mode was 100(%) and a branching ratio of each decay mode was Jan 14, 2015 Sodium-22 undergoes electron capture according to the following as the equivalent process to positron decay, since both processes result in Feb 9, 2016 In our case we used the Na 22 β isotope that decays by emitting a positron. Na22Source 1 uCi isotope Na22 and Decay Chain.

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Na-22 decay gamma rays from classical novae NASA Grant NAG 5-1565 has provided support for a program of theoretical research in nuclear astrophysics and related areas, focusing upon the possibility of detecting gamma rays from nearby novae. Particular attention has been given to the evaluation of the theoretical expectations for gamma ray emission from four possible sources: (1) the positron 1983-10-01 1964-04-01 We report nearly continuous beta-decay-rate measurements of Na-22, Cl-36, Co-60, Sr-90, and Cs-137 over a period of 2.7 years using four Geiger-Müller tubes. 4) Sodium-22 (Na-22) is radioactive and decays by beta plus decay mode.

2010-02-18 The ratio of electron capture to positron emission in the decay of Na 22 to the 1.28-Mev level in Ne 22 has been determined by a comparison of the intensities of positron emission and 1.28-Mev radiation. The measurements were made with a coincidence arrangement employing a 4 π beta counter to detect the positrons and a scintillation counter for the γ rays.
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The proton and neutron can decay into one another according to the reactions Detection of nuclear decay 22Na emits gamma rays of two distinct energies.

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