Last Updated
：2025/12/06
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 ）
Quizzes for review
(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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See correct answer
prompt criticality
During the experiment, the reactor briefly reached prompt criticality, requiring immediate shutdown procedures.
See correct answer
During the experiment, the reactor briefly reached prompt criticality, requiring immediate shutdown procedures.
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