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Cours

Khabir tanmia

7 Nov, 2025

Cours de Biophysique — Version enrichie avec schémas & données

📊 Cours de Biophysique — version enrichie avec schémas & données

Illustrations SVG, courbes physiques, quiz interactifs, recherche instantanée — tout en un. Prêt pour Blogspot.

🔎

Aucun résultat.

1Radioactivité et rayonnements ▼

📉 Décroissance radioactive – ^99mTc (t₁/₂ = 6.01 h)

Objectifs

Distinguer les types de rayonnements (α, β⁻/β⁺, γ, neutrons).
Maîtriser les lois de décroissance et les grandeurs de base.
Relier stabilité nucléaire et énergie de liaison.

Concepts clés

N(t) = N₀ e^−λt, A(t) = λ N(t), t₁/₂ = ln(2)/λ.
Types: α (faible portée), β (électrons), γ (photons pénétrants), neutrons.

Exemple: Après 12h (~2 demi-vies), restent ~25% de l’activité initiale.

2Interaction rayonnement–matière ▼

📊 Sections efficaces (Photons 30 keV dans Pb, Z=82)

Concepts clés

Effet photoélectrique domine à basse énergie + Z élevé.
Atténuation: I(x) = I₀ e^−μx.

5Rayons X et CT (radiologie) ▼

📏 Échelle de Hounsfield (HU)

Concepts clés

HU = 1000 × (μ − μ_eau) / μ_eau

9Ultrasons (physique et Doppler) ▼

🔍 Résolution axiale vs Fréquence

10Optique de l’œil ▼

👁️ Puissance optique totale ≈ 60 D

5Viscosité et lois d’écoulement ▼

💧 Débit Q ∝ r⁴ (Loi de Poiseuille)

3Production des radioéléments▼

4Médecine nucléaire (γ, SPECT, PET)▼

إضافة تعليق

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