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Related Concept Videos

¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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Laboratory and Field Protocol for Estimating Sheet Erosion Rates from Dendrogeomorphology
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Oscillatory Cs-137 Distribution Pattern in Scotch Pine Bark.

A D Karpov1, I Yu Gorbunov2, V V Kalnin3

  • 1All-Russian Research Institute of Silviculture and Mechanization of Forestry, Pushkino, Moscow oblast, Russia. karpov@vniilm.ru.

Doklady Biological Sciences : Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
|December 12, 2023
PubMed
Summary

The study reveals a novel wave-like pattern in the vertical distribution of cesium-137 (Cs-137) and potassium-40 (K-40) within Scots pine bark. This finding offers insights into radionuclide uptake and distribution in trees.

Keywords:
Scotch pineanthropogenic radionuclidesbarkdistribution of radionuclidesradioactive contamination of forestradiocesiumvertical distribution

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Area of Science:

  • Environmental Science
  • Radiochemistry
  • Forest Ecology

Background:

  • Anthropogenic radionuclides like Cesium-137 (Cs-137) are environmental contaminants.
  • Understanding their distribution in forest ecosystems is crucial for risk assessment.
  • Scots pine (Pinus sylvestris L.) is a common tree species in contaminated areas.

Purpose of the Study:

  • To investigate the vertical distribution of Cs-137 in Scots pine bark.
  • To analyze the co-distribution of natural radionuclide K-40 with Cs-137.
  • To identify novel patterns in radionuclide accumulation within tree tissues.

Main Methods:

  • Sampling of Scots pine bark in 10-cm segments up to 17m height.
  • Measurement of Cs-137 and K-40 specific activities using gamma-ray spectrometry.
  • Analysis of vertical distribution patterns and correlation between radionuclides.

Main Results:

  • A unique wave-like (oscillatory) vertical distribution pattern of Cs-137 was observed in pine bark.
  • Potassium-40 (K-40) exhibited a similar oscillatory pattern, suggesting shared uptake mechanisms.
  • Significant positive correlation found between Cs-137 in two model trees (r=0.80) and between Cs-137 and K-40 in one tree (r=0.45).

Conclusions:

  • The oscillatory pattern in Cs-137 and K-40 distribution within pine bark is a novel finding.
  • Cs-137 can serve as a radiotracer for studying chemical element uptake and distribution in trees.
  • The findings suggest a common physiological mechanism influencing cesium and potassium transport in woody plants.