inhourn.

/ˈɪnaʊə/

Etymology: < in(verse) hour: so named because if the reactivity is small it is inversely proportional to the corresponding reactor period (to a first approximation).

Nuclear Physics.

A unit for expressing the reactivity of a nuclear reactor, being the reactivity of one having a reactor period of one hour (i.e. in which the neutron flux increases by a factor e in one hour).

ΘΚΠ

the world > matter > physics > atomic nucleus > nuclear fission > nuclear fuel > [noun] > unit of reactivity

inhour1947

1947 H. L. Anderson et al. in Physical Rev. 72 17/1 The unit of [control] rod position was given the name inhour (from ‘inverse hour’, symbol: ih), with the significance that when the control rod is displaced from the critical position by 1 inhour, the pile will have a period of (very nearly) 1 hour.

1947 H. L. Anderson et al. in Physical Rev. 72 21/2 The inhour is useful as a measure of rod displacement because it is a measure of pile reactivity which is independent of the position of the control rod.

1954 R. Stephenson Introd. Nucl. Engin. vii. 269 There is no simple relationship between inhours of reactivity and pile period observed. Thus 2 inhours of reactivity do not make the pile period equal to 2 hr, nor do they make the pile period exactly one-half an hour, although for small reactivities the number of inhours is about directly proportional to the reactivity.

1966 D. Jakeman Physics Nucl. Reactors ix. 340 Equation 9.69 is referred to as the inhour equation and is used to define a unit of reactivity called the inhour. This is the amount of reactivity to give a reactor period of 1 hour and for a U²³⁵ system is equal to a reactivity of 2·62 × 10⁻⁵.

This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2018).

单词	inhour
释义	inhourn. /ˈɪnaʊə/ Etymology: < in(verse) hour: so named because if the reactivity is small it is inversely proportional to the corresponding reactor period (to a first approximation). Nuclear Physics. A unit for expressing the reactivity of a nuclear reactor, being the reactivity of one having a reactor period of one hour (i.e. in which the neutron flux increases by a factor e in one hour). ΘΚΠ the world > matter > physics > atomic nucleus > nuclear fission > nuclear fuel > [noun] > unit of reactivity inhour1947 1947 H. L. Anderson et al. in Physical Rev. 72 17/1 The unit of [control] rod position was given the name inhour (from ‘inverse hour’, symbol: ih), with the significance that when the control rod is displaced from the critical position by 1 inhour, the pile will have a period of (very nearly) 1 hour. 1947 H. L. Anderson et al. in Physical Rev. 72 21/2 The inhour is useful as a measure of rod displacement because it is a measure of pile reactivity which is independent of the position of the control rod. 1954 R. Stephenson Introd. Nucl. Engin. vii. 269 There is no simple relationship between inhours of reactivity and pile period observed. Thus 2 inhours of reactivity do not make the pile period equal to 2 hr, nor do they make the pile period exactly one-half an hour, although for small reactivities the number of inhours is about directly proportional to the reactivity. 1966 D. Jakeman Physics Nucl. Reactors ix. 340 Equation 9.69 is referred to as the inhour equation and is used to define a unit of reactivity called the inhour. This is the amount of reactivity to give a reactor period of 1 hour and for a U²³⁵ system is equal to a reactivity of 2·62 × 10⁻⁵. This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2018). < n.1947
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