Radiation Interactions with Matter

Question 1

Characteristics of Alpha Radiation

Answer 1

Emitted from Nucleus.
Essentially an helium nucleus
4 AMU
+2 Charge
Mono-energetic
Least Pentrating of all ionizing radaiton
Range in air- several CMs
Range in tissue- measured in micrometers
High Internal Hazard

Question 2

Alpha Radiation interaction with matter

Answer 2

*they interact readily with orbital elections of matter through direct collision and by ionization and excitation.
*They leave a dense path of ion pairs and travel in a short range.
* Slow speed and travels in a straight path.

Question 3

Characteristics of beta radiation

Answer 3

*Emitted from the nucleus
*Mostly internal hazard
* Essentially an energetic election (High KE)
*Can negatively or positively charged.
*Emitted in a spectrum of energies
*More penetrating than alpha radiation

Question 4

How does beta radiation interact with matter?

Answer 4

Travels in a diffuse manner via a long winding path by direction collision and ionization, excitation, and Bremsstrahlung.

Question 5

What are the properties of photons?

Answer 5

Have Energy
Have momentum
Have no mass
No charge
Travels at the speed of light

Question 6

Gamma rays orgin

Answer 6

Emitted from the nucleus, occurs when a proton or neutron drops from a higher energy state to a lower energy state. This difference produces an gamma ray.

Question 7

X-rays orgin

Answer 7

X-rays are emitted from the electron cloud or electron interactions.
Occurs when an electron in a higher shell drops down to produce an vacancy.
The energy left over from this produces an X-ray

Question 8

What are the three interactions of photons with matter?

Answer 8

*Photoelectric effect
*Compton Scattering
*Pair Production

Question 9

CS PP PEE

Answer 9

Three interactions with matter of photon radiation.
Compton Scattering
Pair Production
Photoelectric Effect

Question 10

What is Photoelectric effect?

Answer 10

An incident photon interacts with an orbiting electron, freeing it with KE.

Question 11

Compton Scattering

Answer 11

An incident interacts with an orbiting electron, freeing it with KE and a new lower energy photon is emitted

Question 12

Pair Production

Answer 12

A photon of suffice energy moves in the presence of a highly charged nucleus, and splits into an electron-positron pair.

Question 13

Characteristics of neutron Radiation

Answer 13

Emitted from a nucleus as a result of nuclear fission
Emitted in a spectrum of energies
All neutrons are born fast
1 AMU

Question 14

Types of interactions of fast neutrons with matter

Answer 14

*Elastic scattering
*Inelastic scattering

Question 15

Interactions of thermal neutrons with matter

Answer 15

*Radiative capture
*Fission
*Charge particle emission

Question 16

What are the properties of photons?

Answer 16

• Have Energy
• Have momentum
• Have no charge
• Have no Mass
• Travel at the Speed of light

Question 17

Interactions of thermal neutrons?

Answer 17

• Radiative Capture
• Charge Particle Emission
• Fission