Tech Street: PO Box 639Tech Street: C/O Tech City: Kirkland Tech State/Province: WATech Postal Code:98083Tech Country: USTech Phone: 1.4252740657Tech Phone Ext: Tech Fax: 1.4259744730Tech Fax Ext: Tech Email:[email protected] Server: DNS1. COMName Server: Name Server: Name Server: Name Server: Name Server: Name Server: Name Server: Name Server: DNSSEC: Unsigned Access to Public Interest Registry WHOIS information is provided to assist persons in determining the contents of a domain name registration record in the Public Interest Registry registry database.By assuming that cosmic-ray intensity depends only on atmospheric depth and effective vertical cutoff rigidity, these models can be used to correct production rates for temporal changes in geomagnetic intensity using paleomagnetic records. However, until recently there has been no attempt to thoroughly evaluate the large body of modern cosmic-ray literature, to explain systematic discrepancies between measurements or to put these data into a rigorous theoretical framework appropriate for cosmogenic dating.Our analysis shows that effective nucleon attenuation lengths measured with neutron monitors over altitudes 0-5000 m range from 128 to 142 g cm-2 at effective vertical cutoff rigidities of 0.5 and 14.9 GV, respectively.We attribute the difference to a combination of two factors: The neutron monitor is more sensitive to the higher end of the nucleon energy spectrum, and the shape of the nucleon energy spectrum shifts towards lower energies with increasing atmospheric depth. TY - JOURT1 - Spatial and temporal distribution of secondary cosmic-ray nucleon intensities and applications to in situ cosmogenic dating AU - Desilets, Darin AU - Zreda, Marek PY - 2003/1/30Y1 - 2003/1/30N2 - Cosmogenic nuclide production rates depend critically on the spatio-temporal distribution of cosmic-ray nucleon fluxes.We have derived separate scaling models for thermal neutron reactions and spallation reactions based on a comprehensive analysis of cosmic-ray survey data. Since the 1950s, measurements of the altitude, latitude and solar modulation dependencies of secondary cosmic-ray fluxes have been obtained by numerous investigators.It reveals the attitudes that were instilled in the individual by their family and developed in their childhood. Cosmogenic nuclide production rates depend critically on the spatio-temporal distribution of cosmic-ray nucleon fluxes.
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We can measure the present ratios of 87Sr/86Sr)t and (87Rb/86Sr)t with a mass spectrometer, thus these quantities are known.
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If we use this system to plug into equation (2), then 87Sr* = 87Rb (eλt-1) (3) but, 87Srt = 87Sr0 87Sr* or 87Sr* = 87Srt - 87Sr0 Plugging this into equation (3) 87Srt = 87Sr0 87Rb (4) We still don't know 87Sr0 , the amount of 87Sr daughter element initially present.
For this decay reaction, λ = 1.42 x 10-11 /yr, τ1/2 = 4.8 x 1010 yr at present, 27.85% of natural Rb is 87Rb.