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Samenvatting Stralingsdeskundigheid II

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Stralingsdeskundigheid II, Hanzehogeschool MBRT jaar 2. Samenvatting van colleges, werkcolleges en praktijklessen. Plus een aantal oefenvragen.

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THEMA 20
STRALINGSDESKUNDIGHEID
T20 SD Herhaling

Straling = elke overdracht van energie vanuit een bron naar de omgeving zonder dat hiervoor een
medium nodig is




Elektromagnetische straling (toevoegen aan stralen kaart)
• Samenhang tussen golflengte en frequentie

𝑪= 𝛌 ∗𝐟



c = snelheid EM golven  lichtsnelheid = 3 * 108 m/s
λ = golflengte (m)
f = frequentie (Hz of s-1)

,Wanneer is een stof radioactief
Natuur streeft naar stabiliteit

- Onjuiste verhouding protonen/ neutronen (instabiel
- Energie overschot in de kern

 Gevolg

- Uiteenvallen (desintegreren) atomaire kern
- Uitzenden radioactieve ioniserende straling
(Het atoom is radioactief, de straling is ioniserend)




Vervalwijze
De kern van een element kan op verschillende manieren veranderen

Onjuiste verhouding p/n

- a-verval
- b-verval
- elektronenvangst (EC)
- spontane splijting



Energie overschot in de kern

- Isomeer verval (y-verval)
- Interne conversie (IC)

, Wisselwerking
Straling  omgeving
- Vormt de basis voor
• Dosimetrie
• Kwalitatieve/ kwantitatieve meting van straling
• Afscherming
• Evaluatie van biologische effect ten gevolge van blootstelling aan straling



Onderscheidt in
- Direct ioniserende straling  a, b, protonen
snelle geladen deeltjes geven hun energie direct af aan de materie

- Indirecte ioniserende straling  fotonen, neutronen
Ongeladen deeltjes/pakketjes energie geven hun energie af aan gelden deeltjes




Wisselwerking geladen deeltjes
Maximaal afgelegde afstand = dracht (R)
- Maximale indringdiepte van deeltje in materie loodrecht op de as van binnendringen
- Afhankelijk van
• Lading deeltje
• Energie deeltje
• Massa deeltje
• Materiaal
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