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Related Concept Videos

Biological Effects of Radiation02:59

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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Isotopes and Radioisotopes01:28

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In the early 1900s, English chemist Frederick Soddy realized that an element could have atoms with different masses that were chemically indistinguishable. These different types are called isotopes — atoms of the same element that differ in mass. Isotopes differ in mass because they have different numbers of neutrons but are chemically identical because they have the same number of protons. Soddy was awarded the Nobel Prize in Chemistry in 1921 for this discovery.
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Types of Radioactivity

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The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
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Radioactive Decay and Radiometric Dating02:48

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Radioactivity is a spontaneous disintegration of an unstable nuclide and is a random process, as all the nuclei in the sample do not decay simultaneously. The number of disintegrations per unit time is called the activity (A), which is directly proportional to the number of nuclei in the sample. The decay constant (λ) is an average probability of decay per nucleus in unit time.
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Mutations01:35

Mutations

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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Radiation: Applications01:17

Radiation: Applications

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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Carbon Ion Radiobiology.

Walter Tinganelli1, Marco Durante1,2

  • 1Biophysics Department, GSI Helmholtzzentrum für Schwerionenforchung, Planckstraße 1, 64291 Darmstadt, Germany.

Cancers
|October 21, 2020
PubMed
Summary

Carbon ion therapy offers unique radiobiological advantages for treating radioresistant tumors, with similar normal tissue toxicity to conventional radiotherapy. These distinct properties may improve cancer treatment outcomes and potentially boost immune response.

Keywords:
RBEcarbon ionshypoxiaimmunotherapymetastasisparticle therapyradiobiologyradiotherapy

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Area of Science:

  • Oncology
  • Radiation Oncology
  • Medical Physics

Background:

  • Particle therapy, particularly proton therapy, is increasingly used in cancer treatment.
  • While protons offer physical advantages over X-rays, their biological response is similar.
  • Heavy ions, like carbon ions, possess unique radiobiological properties beneficial for treating radioresistant and hypoxic tumors.

Purpose of the Study:

  • To evaluate the radiobiological characteristics of carbon ion therapy.
  • To compare the efficacy and toxicity of carbon ions with X-rays and protons.
  • To explore the potential of carbon ions as a distinct therapeutic agent in oncology.

Main Methods:

  • Review of radiobiological properties of accelerated charged particles, focusing on carbon ions.
  • Comparison of relative biological effectiveness (RBE) and oxygen enhancement ratio (OER) of carbon ions versus X-rays.
  • Analysis of potential clinical benefits including reduced normal tissue toxicity and enhanced tumor control.

Main Results:

  • Carbon ions exhibit increased relative biological effectiveness and a reduced oxygen enhancement ratio in the target region compared to X-rays.
  • Normal tissue toxicities and second cancer risks associated with carbon ion therapy are comparable to conventional radiotherapy.
  • Distinct radiobiological properties of carbon ions suggest potential for increased immune response, reduced angiogenesis, and lower metastatic potential.

Conclusions:

  • Carbon ion therapy presents a unique therapeutic option in oncology due to its distinct radiobiological profile.
  • Patient selection and tailored treatment protocols are crucial for optimizing clinical outcomes with carbon ion radiotherapy.
  • The specific properties of carbon ions warrant their consideration as a novel 'drug' for advanced cancer treatment strategies.