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Related Concept Videos

Radical Formation: Addition00:47

Radical Formation: Addition

Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an unpaired...
Biological Effects of Radiation02:59

Biological Effects of Radiation

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 produce ions...
Types of Radioactivity03:23

Types of Radioactivity

The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
Radical Formation: Elimination00:51

Radical Formation: Elimination

Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions with respect to...
Types of Coprecipitation01:10

Types of Coprecipitation

Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
Nuclear Transmutation03:20

Nuclear Transmutation

Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons being...

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Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
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Published on: October 21, 2016

Additional contamination when radon is in excess.

A Martín Sánchez1, J de la Torre Pérez, A B Ruano Sánchez

  • 1Department of Physics, University of Extremadura, 06006 Badajoz, Spain. ams@unex.es

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|April 4, 2013
PubMed
Summary
This summary is machine-generated.

Radon daughters adhere to clothes, skin, and hair in high-radon environments. This surface contamination adds to the overall radioactive exposure from radon and its progeny in the air.

Keywords:
External additional radioactive contaminationRadonRadon progeny

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Area of Science:

  • Environmental Science
  • Radiological Protection
  • Occupational Health

Background:

  • Radon (222Rn) is a naturally occurring radioactive gas.
  • High concentrations of radon have been measured in specific environments, such as tourist caves.
  • Understanding radon progeny behavior is crucial for assessing radiation exposure.

Purpose of the Study:

  • To investigate the adherence of radon (222Rn) progeny to clothing, skin, and hair.
  • To quantify the additional radioactive concentration on personal surfaces due to radon progeny.
  • To assess the implications for human exposure in environments with very high radon levels.

Main Methods:

  • Field study conducted in a location with exceptionally high radon concentration (approx. 32 kBq/m3).
  • Analysis of radon progeny behavior on fabric (clothes), skin, and hair samples.
  • Measurement of radioactive concentration on adhered progeny.

Main Results:

  • Radon (222Rn) daughters were found to adhere significantly to clothes, skin, and hair.
  • This adherence results in an additional radioactive concentration on personal surfaces.
  • The contamination is independent of the radon and progeny present in the breathable air.

Conclusions:

  • Personal clothing, skin, and hair act as significant deposition sites for radon progeny.
  • This surface deposition contributes to the total radiation dose received by individuals in high-radon environments.
  • Further research is needed to develop effective decontamination strategies and minimize exposure risks.