Applikation von Radioaktivität in Industrie, Forschung und Medizin at TU München

Flashcards and summaries for Applikation von Radioaktivität in Industrie, Forschung und Medizin at the TU München

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Exemplary flashcards for Applikation von Radioaktivität in Industrie, Forschung und Medizin at the TU München on StudySmarter:

The basic units for energy and mass in nuclear and atomic physics.

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Radioactive Decay

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Gamma Decay (physical characteristics)

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Electron Capture

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Internal Conversion

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Auger Electron

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Neutron interactions with matter: nuclear reactions.

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Elastic Scattering (n,n)

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Inelastic Scattering (n,n’)

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Radiative Capture (n,ɣ)

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Charged-Particle reactions (n,α), (n,p)

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Structure of atom & nucleus

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Exemplary flashcards for Applikation von Radioaktivität in Industrie, Forschung und Medizin at the TU München on StudySmarter:

Applikation von Radioaktivität in Industrie, Forschung und Medizin

The basic units for energy and mass in nuclear and atomic physics.
●Energy​: Electron Volt (ev) → 1 eV = -eΔV = 1,60217646xC (1 J/C)10−19
→ Kinetic Energy of an electron accelerated in a potential of 1V
●Mass​: Atomic Mass Unit (amu, u) → 1 amu = 1,6605387xkg10−27
→ 1/12 m(C12)

Applikation von Radioaktivität in Industrie, Forschung und Medizin

Radioactive Decay
– unstable atom tries to reach stable form
→ energy and matter are released

transmutation: one element changes into another

Applikation von Radioaktivität in Industrie, Forschung und Medizin

Gamma Decay (physical characteristics)
nuclear reaction → excited nucleus → ɣ-photon is emitted → stable nucleus

discrete energy spectrum

Applikation von Radioaktivität in Industrie, Forschung und Medizin

Electron Capture
quantum effect: probability for the electron to be in the nucleus → K-electron is captured by a proton → neutron is produced → neutrino is emitted

Applikation von Radioaktivität in Industrie, Forschung und Medizin

Internal Conversion
excitation energy of daughter nucleus is transferred to atomic electron
→ electron is ejected
→ inner electron shell vacancy
→ electron transitions
→ X-Ray photons are emitted
→ energy-spectrum is specific (not continuous!)

Applikation von Radioaktivität in Industrie, Forschung und Medizin

Auger Electron
K-shell vacancy from Internal Conversion is filled by L-electron → K-X-Ray is emitted → K-X-Ray is transferred to L-shell electron which is ejected as auger electron

Applikation von Radioaktivität in Industrie, Forschung und Medizin

Neutron interactions with matter: nuclear reactions.
●neutral particle → act directly with the nucleus
●Neutron Cross Section vary rapidly with incident energy and unexpectedly with the type of element and isotope

Applikation von Radioaktivität in Industrie, Forschung und Medizin

Elastic Scattering (n,n)
●The neutron is not absorbed
●It loses energy by transferring part of it to the target nucleus
●Kinetic energy is conserved

Applikation von Radioaktivität in Industrie, Forschung und Medizin

Inelastic Scattering (n,n’)
●The neutron is absorbed
●The nucleus is left in an excited state
●Decays by ɣ-ray and​ n’ ​emission (Attention! was added)
●Kinetic energy is not conserved

Applikation von Radioaktivität in Industrie, Forschung und Medizin

Radiative Capture (n,ɣ)
●Neutron is captured by nucleus
●Excited nucleus decays with ɣ-emission

Applikation von Radioaktivität in Industrie, Forschung und Medizin

Charged-Particle reactions (n,α), (n,p)
●Neutron is absorbed
●excited nucleus decays with proton or α-emission

Applikation von Radioaktivität in Industrie, Forschung und Medizin

Structure of atom & nucleus
– external atomic orbital shell, negativ charge
–> Leptons: electrons (chemical properties)
– atomic nucleus, positive charge
–> Baryons (3 quarks): neutron & proton (nucleons) (nuclear properties)

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