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Pb207

Pb-207 is a stable isotope of the element lead (atomic number 82) with a mass number of 207. It contains 82 protons and 125 neutrons. As a stable nuclide, lead-207 does not undergo radioactive decay under ordinary conditions.

Natural lead consists of several isotopes, including Pb-204, Pb-206, Pb-207, and Pb-208. Pb-207 accounts for roughly

In geochronology, Pb-207 is important for uranium-lead dating. Because uranium-235 decays to lead-207 and uranium-238 decays

The isotope also serves in studies of ore deposits and planetary differentiation, where accurate Pb isotopic

22
percent
of
natural
lead.
It
is
produced
in
the
decay
chain
of
uranium-235
(the
actinium
series)
as
a
stable
end
product,
and
it
occurs
together
with
other
lead
isotopes
in
minerals.
to
lead-206
over
time,
the
ratios
of
Pb-207
to
Pb-235
and
Pb-206
to
Pb-238
provide
two
independent
age
constraints.
These
relationships
underpin
concordia
diagrams
used
to
determine
the
ages
of
rocks
and
mineral
inclusions,
such
as
zircon,
that
retain
their
radiogenic
lead.
Pb-207
is
thus
central
to
establishing
the
timing
of
geological
events
and
the
Earth's
history.
measurements
help
trace
source
materials
and
evolutionary
processes.
Because
Pb-207
is
stable,
it
remains
a
persistent
component
in
analyses
of
ancient
geological
samples
and
contributes
to
calibration
of
isotopic
dating
methods.