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Related Concept Videos

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:
X-ray Imaging01:24

X-ray Imaging

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 X-rays, and by 1900, X-ray was widely...
The Electromagnetic Spectrum02:37

The Electromagnetic Spectrum

The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
The Electromagnetic Spectrum01:24

The Electromagnetic Spectrum

Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...
Emission Spectra02:39

Emission Spectra

When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.

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Related Experiment Video

Updated: May 19, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
06:28

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Published on: January 30, 2020

Gamma-ray bursts.

Neil Gehrels1, Péter Mészáros

  • 1Astrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA. neil.gehrels@nasa.gov

Science (New York, N.Y.)
|August 28, 2012
PubMed
Summary
This summary is machine-generated.

Gamma-ray bursts (GRBs), the universe's most luminous events, remain mysterious despite decades of study. Recent satellite data offers new insights into their prompt emission and afterglow.

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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
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Related Experiment Videos

Last Updated: May 19, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
06:28

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Published on: January 30, 2020

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
06:46

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

Published on: August 25, 2016

Area of Science:

  • Astrophysics
  • Cosmic Ray Physics

Background:

  • Gamma-ray bursts (GRBs) are highly luminous cosmic events.
  • Despite decades of research, the nature of GRBs remains largely unknown.
  • Pioneering space and ground experiments have provided significant, yet incomplete, data.

Purpose of the Study:

  • To review recent observational data from Swift and Fermi satellites.
  • To explore the connection between new GRB observations and theoretical models.
  • To analyze prompt GRB emission and afterglow phenomena.

Main Methods:

  • Surveying recent observational data from space missions.
  • Comparing empirical data with existing theoretical frameworks.
  • Analyzing prompt emission and afterglow characteristics.

Main Results:

  • New data from Swift and Fermi satellites provide unprecedented insights.
  • The interplay between observation and theory is crucial for understanding GRBs.
  • Detailed analysis of prompt emission and afterglow is presented.

Conclusions:

  • Recent advancements have significantly enhanced our understanding of GRBs.
  • Continued integration of observational data and theoretical modeling is essential.
  • Further research is needed to fully unravel the mysteries of GRB emission and afterglow.