Last Updated
：2025/11/21
calcium-45
Noun
uncountable
(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.
Japanese Meaning
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。
Sense（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.
Quizzes for review
(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.
音声機能が動作しない場合はこちらをご確認ください
See correct answer
calcium-45
Researchers measured the uptake of calcium-45 in bone tissue to track new bone formation.
See correct answer
Researchers measured the uptake of calcium-45 in bone tissue to track new bone formation.
音声機能が動作しない場合はこちらをご確認ください
English - English
Word Edit Setting
- Users who have edit permission for words - All Users
- Screen new word creation
- Screen word edits
- Screen word deletion
- Screen the creation of new headword that may be duplicates
- Screen changing entry name
- Users authorized to vote on judging - Editor
- Number of votes required for decision - 1
Sentence Edit Setting
- Users who have edit permission for sentences - All Users
- Screen sentence deletion
- Users authorized to vote on judging - Editor
- Number of votes required for decision - 1
Quiz Edit Setting
- Users who have edit permission for quizzes - All Users
- Users authorized to vote on judging - Editor
- Number of votes required for decision - 1
