Last Updated：2025/12/06
(nuclear physics) The point at which the prompt neutrons produced by a nuclear fission chain reaction are just sufficient to sustain the chain reaction on their own (the state of being prompt critical); past this point, changes in reaction power are controlled by changes in the prompt neutron flux, and occur on a timeframe of milliseconds, too rapidly to be controlled by mechanical means.
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prompt criticality
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Source Word
prompt criticality
Noun
uncountable
usually
(nuclear
physics)
The
point
at
which
the
prompt
neutrons
produced
by
a
nuclear
fission
chain
reaction
are
just
sufficient
to
sustain
the
chain
reaction
on
their
own
(the
state
of
being
prompt
critical);
past
this
point,
changes
in
reaction
power
are
controlled
by
changes
in
the
prompt
neutron
flux,
and
occur
on
a
timeframe
of
milliseconds,
too
rapidly
to
be
controlled
by
mechanical
means.
Japanese Meaning
核分裂連鎖反応において、反応中に発生する即時中性子のみで、反応が継続可能な臨界状態を指す。 / 即時中性子が十分に供給され、核分裂連鎖反応が自己持続する状態であり、反応パワーの急激な変動がミリ秒単位で発生する。
Sense（1）
(nuclear
physics)
The
point
at
which
the
prompt
neutrons
produced
by
a
nuclear
fission
chain
reaction
are
just
sufficient
to
sustain
the
chain
reaction
on
their
own
(the
state
of
being
prompt
critical);
past
this
point,
changes
in
reaction
power
are
controlled
by
changes
in
the
prompt
neutron
flux,
and
occur
on
a
timeframe
of
milliseconds,
too
rapidly
to
be
controlled
by
mechanical
means.
（ plural ）
