EXAM III Review

Chapter 13

(1) How did Rutherford measure the nuclear size?

(2) Review Magnetic Resonance Imaging (MRI) principles. See Quiz#4.

(3) Review radioactive decay rates and lifetimes. How is carbon-14 used in carbon dating?

(4) Know the general form of alpha and beta decays.

(5) In alpha-particle decay the alpha-particles gets the largest fraction of the Q released. What is the kinectic energy of the alpha?

(6) In beta-decays the average energy of the electron is KEavg=Q/3 and the maximum energy KEmax= Q.

 

Chapter 14 (HW 1, 11, 53 )

(1) What is the KE hreshold for inducing a nuclear reaction? KEa > |Q|(1+ma/mA)

a + A -> B+C+D

(2) Understand the reaction cross section and attenuation of a beam of particles in a maerial. What power is released in a material? see Quiz#5.

I = Io exp{ n s z }

(3) Photons are attenuated in matter by a similar law where m = attenuation coefficient.

I = Io exp{ -m z }

(4)Heavy charged particles lose energy in material by the Bethe-Bloch formula. See Chapter 14 notes.

-1/r dE/dx = 2 MeV-cm2/g at the minimum.

(5) The dose in rem = dose in rad x HBE factor. 1 rad = 1/100 J/Kg.