Card Set Information
Obj 11 13
number of neutrons that vary.
Deuterium, an isotope of hydrogen; Deuterium plus oxygen makes up so-called heavy water (D
O), 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
I 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
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,
H 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.