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Related Concept Videos

Isotopes and Radioisotopes01:28

Isotopes and Radioisotopes

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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.
An isotope containing...
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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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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.
The average...
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X-ray Imaging01:24

X-ray Imaging

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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Absorption of Radiation01:05

Absorption of Radiation

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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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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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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
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[Radiobiology for beginners].

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    Advancements in radiotherapy, driven by technology, aim to optimize radiation dose delivery to tumors while minimizing exposure to healthy tissues. This leads to a reevaluation of radiobiological principles, exemplified by the resurgence of hypofractionated radiotherapy.

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    Area of Science:

    • Medical Physics
    • Radiation Oncology
    • Radiobiology

    Context:

    • Rapid technological advancements in computing, imaging, and robotics are transforming modern radiotherapy.
    • There is a growing need to optimize radiation dose distribution for improved tumor targeting and reduced healthy tissue exposure.

    Purpose:

    • To explore the impact of technological evolution on radiotherapy.
    • To discuss the renewal of radiobiological concepts driven by dose optimization strategies.

    Summary:

    • Modern radiotherapy benefits from significant progress in computer technology, imaging, and robotics.
    • The core challenge involves optimizing radiation dose delivery to the tumor while sparing surrounding healthy tissues.
    • This optimization necessitates a re-evaluation of fundamental radiobiological principles, leading to approaches like hypofractionated radiotherapy.

    Impact:

    • This evolution is leading to more precise and effective cancer treatments.
    • The rediscovery of techniques like hypofractionated radiotherapy offers new therapeutic possibilities.
    • Enhanced understanding of radiobiology in the context of advanced technology promises improved patient outcomes.