Fiche 2 MS Flashcards

1
Q

Charge électrique élémentaire

A

1e=1,6.10-19C

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2
Q

Défaut de masse de X

A

ΔM=[Z.mP+N.mN]-M(A,Z)

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3
Q

Relation d’einstein: énergie de liaison nucléaire

A

B(A,Z)=ΔM.c2

B(A,Z)=ΔE

=énergie qu’il faut fournir au noyau pr en séparer les nucléons

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4
Q

Énergie libérée lors d’une transition

A

Q=[M(réactifs-M(produits].c2

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5
Q

Énergie cinétique particule α

A

Τα=MY.Qα/MY+Mα~Qα

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6
Q

Energie maximale du spectre de l’électron (lorsque l’antineutrino est émis au repos)

A

Qmax,e-=Qβ-=(Mx-My).c²

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7
Q

Energie max du Spectre de positon

A

Qmax,e+=Qβ+=(Mx-My-2me).c²

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8
Q

Annihilation du positon

A

hv=me.c²=511keV

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9
Q

Énergie libérée lors d’une capture électronique

A

Qce=(Mx-My).c²-Wn

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10
Q

Énergie du photon (ou éléctron) émis lors de la desexcitation d’un noyau:
(2 types)

A

Rayonnement γ:
(hv)γ=ΔE
(Exposant gamma)

Conversion interne:
T(eCI)=ΔE-W

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11
Q

Nombre de nucléides pères: (2 expressions)

A

N(t)=N₀e(-λt)

N(t)=N₀.2^(-t/T)

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12
Q

Activité d’un échantillon

A

A=Nλ
=A0.e(λt)
=A0.2^(-t/T)
=A0/2^n

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13
Q

Masse d’une source radioactive

A

m=M/Na . AT/ln2

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