Sentences with phrase «radionuclide production»

As seen in Figure 6, particularly the higher - frequency variations in the two radionuclide estimates agree rather well in phase and show higher amplitudes than the geomagnetic reconstructions, confirming the results by Snowball et al. (2007) that variations in radionuclide production rates on up to multi-centennial time scales are dominated by solar magnetic field variations.

This is essential when using radionuclide production rates to infer past solar activity, which is of high interest to reveal the solar influence on Earth's climate variability (e.g., Marsh & Svensmark 2003; Solanki et al. 2004; Muscheler et al. 2005b; Usoskin et al. 2006; Snowball et al. 2007).

Finally, we include a comparison to past geomagnetic field estimates obtained with multi-centennial to millennial - scale filtering from 14C and 10Be radionuclide production records.

An alternative recorder for past geomagnetic field changes are cosmogenic radionuclide production rates, which are modulated by variations of both the solar magnetic field strength and the geomagnetic field intensity.

However, regional differences in the radionuclide production rates are caused by the nature of dipole field.

The cosmogenic radionuclide records have been low - pass filtered by a rectangular function in the frequency domain with different cut - off frequencies in order to minimise the solar influence and to investigate the time scales on which we see common changes in the radionuclide production rates and the geomagnetic field intensity reconstructions.

The somewhat contradictory results for the similarity of radionuclide - based dipole reconstructions and geomagnetic field models on these time scales point out that geomagnetic field models have to be improved further before they can provide a truly robust means to eliminate the influence of geomagnetic variability in cosmogenic radionuclide production studies.

Dipole intensity estimates from cosmogenic radionuclide production records, with suitable filtering to minimise the solar influence, have also been included in the comparison to provide independent information about variations in the strength of the geomagnetic field.

Solar variability and the geomagnetic field affect the flux of cosmic rays entering the atmosphere and subsequently, the radionuclide production rate (Beer et al. 2012).

The processes responsible for the radionuclide production are well known and can be modeled quantitatively.

Similarly to the solar magnetic modulation, high geomagnetic field intensity decreases the flux of galactic cosmic rays and radionuclide production rates and the opposite for low geomagnetic field intensity.

Cosmogenic radionuclide production rates are also influence by the geomagnetic field.

The computations show similar long - term variations with the global radionuclides production records from terrestrial archives such as tree rings and ice cores which validate the approach.

Not exact matches

One such product linked to these activities, isosaccharinic acid (ISA), causes much concern as it can react with a wide range of radionuclides — unstable and toxic elements that are formed during the production of nuclear power and make up the radioactive component of nuclear waste.

Pearce, who came to the Laboratory in 2009, is investigating how minerals and microbes affect technetium and other radionuclides in the soil at a former plutonium production site in southeastern Washington State.

We reconstruct, by applying our model, the modulation potential since 1616, a parameter that describes the mean energy loss of GCR particles within the heliosphere due to solar modulation, and using that, we model the global production of radionuclides 14C and 10Be, adopting the method described in Kovaltsov et al. (2012) and Kovaltsov & Usoskin (2010), respectively.

The radionuclide signal reflects mainly production (Berggren et al. 2009), making them a useful tool of solar variability reconstructions in the past (Usoskin 2013).