Alpha rays


  • Webster's Revised Unabridged Dictionary
    • Alpha rays (Physics & Chem) Rays of relatively low penetrating power emitted by radium and other radioactive substances, and shown to consist of positively charged alpha particleshelium nuclei) having enormous velocities but small masses. They are slightly deflected by a strong magnetic or electric field. Compare beta ray and gamma ray. Because the rays penetrate only a small distance in dense matter such as living tissue, small pellets of radioactive substances emitting alpha rays have been used to cause local destruction of tissue, as in cancer therapy.
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In literature:

Some of the radium products give out alpha-rays only, one beta- and gamma-rays, while one yields all three types of radiation.
"Darwin and Modern Science" by A.C. Seward and Others
The "alpha"-ray (a-ray) is such a material ray.
"The Birth-Time of the World and Other Scientific Essays" by J. (John) Joly
The gamma count was far below the alpha, but there were too many of the rays around for comfort.
"Rip Foster in Ride the Gray Planet" by Harold Leland Goodwin
Thermic induction, atomic disintegration, the Lavender Ray, these were the Alpha, the Sigma, the Omega of his existence.
"The Man Who Rocked the Earth" by Arthur Train
Sir Ernest Rutherford christened them, after the first three letters of the Greek alphabet, the Alpha, the Beta, and Gamma rays.
"The Outline of Science, Vol. 1 (of 4)" by J. Arthur Thomson
Professor E. Rutherford has named these rays beta (B), alpha (a), and gamma (v) rays respectively.
"A History of Science, Volume 5(of 5)" by Henry Smith Williams
The alpha rays are projected particles which lose energy in penetrating matter.
"A Brief Account of Radio-activity" by Francis Preston Venable
For convenience the three sorts are termed Alpha, Beta and Gamma rays, respectively, after the first three letters of the Greek alphabet.
"The Romance of War Inventions" by Thomas W. Corbin
The alpha rays have little penetrating power, a sheet of paper or a sheet of aluminum 0.05 mm.
"Physics" by Willis Eugene Tower

In news:

Researchers used the Curiosity rover's mast camera, on September 7, to take a photo of the Alpha Particle X-Ray Spectrometer.
Earl Ray Tomblin recognized Alpha Delta Kappa Month in October with a proclamation .

In science:

At the operating temperature of 133K, a single K-alpha x-ray will generate 1580 electron/hole pairs, which, depending on the location of the x-ray relative to the pixel potential wells, may be localized in a single pixel or shared among two or more pixels.
The effects of charge transfer inefficiency (CTI) on galaxy shape measurements
The Alpha Magnetic Spectrometer (AMS), an instrument originally devised for the search for antimatter in cosmic rays, will also be able to identify γ -rays (Bertucci et al., 2001).
Gamma-ray astronomy
Fig. 9.— Top: H-alpha contours overlaid on the soft X-ray greyscale.
Chandra Observations of Extended X-ray Emission in Arp 220
At energies below 1 TeV, the Alpha Magnetic Spectrometer (AMS) will measure the spectra of cosmic ray species with higher accuracy that has been possible.
Nuclear and Particle Astrophysics at CIPANP 2003
Left: The image orientation angle, alpha, for ON and OFF source observations after gamma-ray selection cuts Right: The two-dimensional map of reconstructed source position.
Status and Performance of the First VERITAS telescope