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OCR Page 1 of 20AN ANALYSIS OF THE MINERAL PADIUM
Radium, an alkaline earth motal, is one of the
nost important of the radiosetive elements found in nature.
This is due to its relatively long life end the fact that
it is the parent of E series of redioactive elements which
enit minute particles of matter or radiations, useful
industrially and therapeutically. Radium was discovered by
Professor and Madame Curie in Paris in 1898 as the result
of attempts to identify the source of invisible radiations
which affected unexposed photographic plates.
A radioactive alement is an element which possesses
the chemical end physical properties of the nornal, stable
element, but differs in that a portion of it, as a conse-
quence of the emission of rays or particles, is continually
undergoing a change, at a fixed and determinable rate, into
other radioactive elements, until a series of disintegrations
is completed and the final elenent is non-radioactive. This
series of changes is called *a disintegration series". In
it each element is the parent of the one which follows and
the child of the one which precedes it. Starting with the
element redium, such a *disintegration series", comprising
nine successive changes, ultimately results in the non-
radiosetive element, lead.
This series of disintegrations is the result of
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