Interaction of radiation with matter Flashcards
What’s formed in the Alpha process?
Alpha particle (Helium nucleus)
What’s formed in the Gamma process?
Photons
What’s formed in the B- + process?
Beta +: proton into neutron, positron and neutrino.
Beta -: neutron into proton, electron and antinuetrino.
Which processes of decay are monoenergetic and which are polyenergetic?
Monoenergetic: Alpha and Gamma.
Polyenergetic: Beta.
What type of process is radioactive desintegration?
Stochastic process
Impossible to predict the behaviour of a single nucleotide
But know the probability of disintegration must be the same for all the nuclides of the same isotope.
What type of equation is the one that predicts the behaviour of a radioactive source?
Exponential Equation
What’s the formula of N(t)
N(t)=Nºe^(Landa por t)
By which two factor is the exponential cruve determined?
Decay constant (landa) and the mean lifetime/mean decay time
Mean decay time/mean lifetime formula and what it is?
To=1/Landa
Time when number of nucleotides which haven’t desintegrated is No/e 73%
What indicated the activity?
And unit used to measure
How many atoms desintegrate per second.
Measured in Becquerels (Bq)
Formula of Actvity
A (t) = -dN(t)/dt
A= Landa x N(t)
Formula to know the energy released per second
Edecay x (Number of decays/second)
E = Edecay x Activity
E = E decay x landa x N
What’s the half-life?
Time for half of the atoms to decay.
Two steps by which high energy photons are generated in an X ray tube.
- Electrons are accelerated until they have high kinetic energy.
- Electrons collide with a dense material and generate high energy photons.
Estudiar todos los detalles en el libro, todo el proceso.
Three ways in which an electron can interact whith an atom.
- Deviates and emmits some kinetic energy in the form of EM radiation (Photons). (Bremsstrahlung radiation)
- Collides with an electron and a photon is released. (X-ray characteristic)
- Collides with the nuclei and energy is released.
