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Related Concept Videos

Radioactive Decay and Radiometric Dating02:48

Radioactive Decay and Radiometric Dating

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.
Positron Emission Tomography01:29

Positron Emission Tomography

Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
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Radiological Investigation I: X-ray and CT01:30

Radiological Investigation I: X-ray and CT

Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and the...
Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

Radiological Investigation II: MRI and Ventilation Perfusion Scan

Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
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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...
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...

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Related Experiment Video

Updated: Jul 19, 2026

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space
14:19

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space

Published on: February 1, 2016

[Radon in Tunisian buildings].

Michèle V El May1, Neila Chahed, Azza Hammou

  • 1Centre National de Radio Protection, Hôpital d'Enfants Place Bab Saadoun, Tunis.

La Tunisie Medicale
|October 17, 2006
PubMed
Summary

Radon gas, a lung cancer risk, was measured in 1151 Tunisian homes. All radon concentrations were below international safety limits, indicating low risk in these dwellings.

Area of Science:

  • Environmental Science
  • Radiological Health
  • Public Health

Context:

  • Radon (Rn) is a naturally occurring radioactive gas originating from soil.
  • Elevated indoor radon concentrations pose a significant lung cancer risk.
  • Understanding regional radon levels is crucial for public health risk assessment.

Purpose:

  • To quantify indoor radon concentrations across all inhabited regions of Tunisia.
  • To assess potential public health risks associated with radon exposure in Tunisian dwellings.
  • To establish baseline radon data for Tunisia.

Summary:

  • This study presents the first comprehensive measurement of indoor radon concentrations in 1151 Tunisian homes using alpha-track detectors over two months.
  • The median radon concentration was 36 Bq m⁻³, with a maximum of 512 Bq m⁻³.

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Last Updated: Jul 19, 2026

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space
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  • All measured radon levels were found to be below established international safety guidelines.

    • Impact:

    • Provides essential data for evaluating radon-induced lung cancer risk in Tunisia.
    • Informs public health policies and potential mitigation strategies for indoor radon.
    • Establishes a benchmark for future radon monitoring studies in the region.