Radioactive - Law Dictionary Search Results
Polonium
A radioactive chemical element discovered by M and MMe Curie in pitchblende and originally called radium F It has atomic
Protactinium
The radioactive chemical element of atomic number 91 Atomic symbol Pa at wt of longest lived isotope 231 T12 32500
Radium
An intensely radioactive metallic element found combined in minute quantities in pitchblende and various other uranium minerals Symbol Ra atomic weight
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Half life
it takes for one half of a substance decaying in a first order reaction to be destroyed For radioactive substances it is the time required for one half of the initial amount of the radioactive isotope to
Gamma ray
A very penetrating electromagnetic ray not appreciably deflected by a magnetic or electric field emitted by radioactive substances Gamma rays are photons of electromagnetic radiation having a wavelength shorter than that of X rays i
radioactivity
ionization in matter through which it passes and is therefore called ionizing radiation The radiation emitted by most radioactive substances is one of three types alpha rays beta rays or gamma rays Some chemical elements have no
radiothorium
an earlier name for the thorium isotope thorium 228 given by its discoverer Otto Hahn It is a radioactive substance formed as one of series of products in the chain of radioactive decay of thorium Its immediate
berkelium
chemical element of the transuranic series Chemical symbol Bk atomic number 97 atomic weight 247 It is a radioactive element with no stable isotopes the longest lived isotope is of mass number 24707 decaying by alpha emission
Beta rays
a form of ionizing radiation emitted by radioactive substances such as radium more penetrating than alpha rays and consisting of negatively charged electrons The electrons are
contaminating
spreading contamination especially radioactive contamination
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