By David Brin
Bestselling, award-winning futurist David Brin returns to globe-spanning, excessive suggestion SF with Existence.
Gerald Livingston is an orbital rubbish collector. For 100 years, humans were leaving behind issues in area, and anyone has to scrub it up. yet there’s anything spinning a little better than he expects, anything that isn’t at the decades’ outdated orbital maps. An hour after he grabs it and brings it in, rumors fill Earth’s infomesh approximately an “alien artifact.”
Thrown into the maelstrom of globally shared adventure, the Artifact is a game-changer. A message in a bottle; an alien tablet that desires to speak. the realm reacts as people constantly do: with worry and desire and selfishness and love and violence. And insatiable curiosity.
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Example text
3. Five fuel samples taken from ZN2 and ZN3 fuel assemblies were dissolved initially in 3 M nitric acid solution at about 110 C, then the dissolution residue was dissolved again in mixed solutions of nitric, hydrochloric, and sulfuric acid at 180 C. Before the measurement of isotopic ratio, the isobar should be separated to avoid contamination. 4 shows a schematic of chemical separation. The dissolution solutions of spent fuels were filtrated and the filtrate solution was fed to an anion-exchange resin of UTEVA (Eichrom, USA) to separate U, Pu, and Nd individually.
In the self-indication method, the contribution from impurity was suppressed and a weak 58 eV resonance of 197Au was emphasized around 120 ch. (Fig. 6). The TOF spectra for the mixture composed of natU, 237Np, and 243 Am are shown in Figs. 8. Although many resonance dips caused by impurities of 237Np and 243Am were observed (Fig. 7), there are no differences J. Hori et al. Estimated thickness [atoms/b] 26 NRTA Self-indication True thickness [atoms/b] Fig. 4 Results of estimated sample thickness for 197Au m NRTA no sample NRTA with Au10 mm NRTA with Au10mm+Ag50 mm m Fig.
It was confirmed that the thickness of the target nuclide can be determined by both methods within 3 % accuracy. The accuracy can be improved further by using a smaller resonance (nσ tot is not large). The TOF spectra with silver and gold samples are shown with the NRTA method in Fig. 5 and with the self-indication method in Fig. 6. 2 eV resonance of 109Ag overlapped around 400 ch. in Fig. 5. In the self-indication method, the contribution from impurity was suppressed and a weak 58 eV resonance of 197Au was emphasized around 120 ch.