元となった辞書の項目
calcium-45
名詞
不可算名詞
(physics)
A
radioactive
isotope
of
calcium,
⁴⁵₂₀Ca,
having
twenty
protons
and
twenty-five
neutrons,
and
a
half-life
of
162.6
days;
it
is
used
as
a
tracer
in
studying
calcium
metabolism.
As
it
decays
it
undergoes
transformation
(nuclear
transmutation)
via
electron
emission,
also
called
negative
beta
decay
(β−-decay),
into
scandium.
日本語の意味
カルシウム-45：放射性カルシウム同位体で、20個の陽子と25個の中性子を持つ。半減期は162.6日であり、カルシウム代謝の研究におけるトレーサーとして利用され、崩壊時には電子放出（β⁻崩壊）を経てスカンジウムに変わる。
意味（1）
(physics)
A
radioactive
isotope
of
calcium,
⁴⁵₂₀Ca,
having
twenty
protons
and
twenty-five
neutrons,
and
a
half-life
of
162.6
days;
it
is
used
as
a
tracer
in
studying
calcium
metabolism.
As
it
decays
it
undergoes
transformation
(nuclear
transmutation)
via
electron
emission,
also
called
negative
beta
decay
(β−-decay),
into
scandium.
