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number of neutrons that vary.
Deuterium, an isotope of hydrogen; Deuterium plus oxygen makes up so-called heavy water (D2O), a compound used as a tracer in metabolic studies.
Tritium; an isotope of hydrogen. Tritium is unstable and a tritium atom will fall apart, on average, after 12 yrs. We call this half-life.
Some combinations of protons and neutrons that are unstable.
Each time a fission occurs
Three neutrons are produced and the nucleus splits into two.
More neutrons are found in the nucleus than can be supported, and the .....
nucleus is unstable
131I is a by product of
Uranium Nuclear Fission
Most radiation is due to
Neutron; atomic number 0; mass number 1
Proton; atomic number 1; mass number 1
Beta particle (electron)
Positron (positive electron); atomic number 1; mass number 0
Alpha particle (helium nucleus); atomic number 2; mass number 4
Deuteron (heavy hydrogen nucleus); atomic number 1; mass number 2
Y (similar symbol)
Gamma particle (high energy photon); comes from nuclei; no charge; no measurable mass
In an alpha particle what is missing
are electrons expelled at high energy from radioactive atoms. For example, 3H is a beta emitter.
A gamma particle is
a high-energy packet of light energy (photon). Photons of lower energy are visible light.
photons are both
particle and a wave
Radio waves, microwaves, infrared, visible light, ultraviolet light, X-rays and gamma rays are all "made" of
photons but with diferent momentum (energy) and different wavelengths.
A wavelength is
the distance between the crest of waves.
The height of the wave
is the intensity of the signal (e.g a bright light vs a dim light).
Gamma radiation (photons) are both waves and particles. These waves have both electrical and magnetic properties, we call them
How to measure a wave length
Wavelength is the distance between the peak of each wave crest.
Higher energy = more vibration = shorter lengths
Visible light is in the range of about
400 to 700nm (0.4 to 0.7)
Low energy photons have
_______ waves have the lowest energy and the longest wavelengths.
__________ have the highest energy and shortest wavelengths.
ROY G. BIV
- Red.... lowest energy/longest wavelength
Who is ROY G. BIV
the discoverer of light.
are photons with a high enough energy to penetrate living tissue, so they are used for medical diagnostics.
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