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Biological Effects of Radiation

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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Understanding the motion of particles is a fundamental aspect of classical mechanics, and the choice of the coordinate system plays a pivotal role in unraveling the complexities of their dynamics.
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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
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Highly Sensitive Detection of UV Radiation Using a Uranium Coordination Polymer.

Wei Liu1, Xing Dai1, Jian Xie1

  • 1State Key Laboratory of Radiation Medicine and Protection, School for Radiological and interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University , Suzhou 215123, China.

ACS Applied Materials & Interfaces
|January 9, 2018
PubMed
Summary

A novel uranium coordination polymer offers highly sensitive UV radiation detection. This material enables precise measurement of accumulated UV dosage, outperforming conventional methods.

Keywords:
DFT calculationUV detectionphotoluminescenceradicaluranium coordination polymer

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Area of Science:

  • Materials Science
  • Chemistry
  • Environmental Science

Background:

  • Accurate UV radiation detection is crucial for chemical industries, environmental monitoring, and biological applications.
  • Conventional semiconductor photodetectors have limitations including complex synthesis, inability to measure accumulated UV dosage, and high defect density.
  • There is a need for new, highly sensitive UV dosage sensors with extremely low detection limits.

Purpose of the Study:

  • To synthesize and investigate a novel uranium coordination polymer as a sensitive UV dosage probe.
  • To explore the mechanism behind UV detection and the material's potential for measuring accumulated UV radiation.
  • To assess the practical applicability of the material in real-world scenarios.

Main Methods:

  • Solvothermal synthesis of a uranium coordination polymer, [UO2(L)(DMF)] (compound 1).
  • Investigation of UV detection capabilities using luminescence spectra, Electron Paramagnetic Resonance (EPR) analysis, single crystal X-ray diffraction, and Density Functional Theory (DFT) calculations.
  • Fabrication of a membrane material from compound 1 for application testing.

Main Results:

  • Compound 1 was successfully synthesized via a mild solvothermal method.
  • The material demonstrated a low UV detection limit of 2.4 × 10^-7 J.
  • A UV-induced radical quenching mechanism was confirmed, with stable radical generation allowing for accumulated UV dosage measurement.
  • The material was successfully fabricated into a membrane without loss of luminescence intensity.

Conclusions:

  • The synthesized uranium coordination polymer (compound 1) functions as a highly sensitive and stable UV dosage probe.
  • The material's ability to measure accumulated UV radiation dosage addresses limitations of conventional detectors.
  • Compound 1 represents a significant advancement in coordination polymer-based UV sensing technology, with potential for practical applications.