Converting between Mci, mgRaeq and Air Kerma

How does one convert between Mci, mgRaeq and Air Kerma for different radioisotopes?

Note on Compton Scattering

In Compton scattering High Energy Photons (10 to 100 Mev) give most of their energy to the Compton electron, while low energy photons give most of their energy to the scattered photon.

Bragg-Gray vs Spencer Attix

Discuss Bragg-Gray theory and how this differs from Spencer-Attix theory.

DRR writes:
Before discussing the actual theory, I'll note that a big difference is that the Spencer Attix formulation accounts for the effects of secondary electrons produced.

Stopping Power

Discuss the difference between Stopping Power and Restricted Stopping Power.

Podgorsak pg 25.

The stopping power focuses on the energy loss by an electron moving
through a medium. When attention is focused on the absorbing medium,
one is interested in the linear rate of energy absorption by the absorbing
medium as the electron traverses the medium. The rate of energy
absorption, called the linear energy transfer (LET), is defined as the
average energy locally imparted to the absorbing medium by an electron
of specified energy in traversing a given distance in the medium.
● In radiation dosimetry the concept of restricted stopping power (SD/r) is
introduced, which accounts for that fraction of the collisional stopping
power (S/r)col that includes all the soft collisions plus those hard collisions
that result in delta rays with energies less than a cut-off value D. In
radiation dosimetry this cut-off energy is usually taken as 10 keV, an
energy that allows an electron just to traverse an ionization chamber gap
of 1 mm in air. Delta rays are defined as electrons that acquire sufficiently
high kinetic energies through hard collisions so as to enable them to carry
this energy a significant distance away from the track of the primary
particle and produce their own ionizations of absorber atoms.

TSET

QUESTION: Shown a diagram depicting a 6 field total skin electron irradiation. Explain the benefits of
such a setup. Be prepared to discuss clinical specifics (e.g. dose prescription, fractionation pattern, dose
inhomogeneity, energy, energy degraders, photon contamination, any required special physics
measurements).

Portal films

You've discovered a problem with some portal films. What would you investigate?

For what photon field size is dmax greatest?

Discuss beam softening

Where does the number 0.876 come from?

Bragg Peak

What is the primary reason we see a Bragg Peak for heavy particles but not for electrons?

Designing a cesium safe

How would you construct a safe to store 500 mCi of Cs-137. What dose restrictions would you use? What materials would you use to construct it?

Dose algorithms (KERNAL)

Explain the term "kernal" and describe algorithms for electron beam calculation

Conversion for brachy sources

Convert from mgRaeq to mCi.

Shielding considerations for a linac with energy >10MV

What are the shielding considerations for a linac with energy >10MV?

KERMA

Define Kerma. Draw a curve and compare vs PDD. At what point does Kerma equal dose.

Work Load, U

With regards to shielding and radiation protection, what are values for the work load with regard to different locations in a clinic?

Effective Dose Limits

What are the effective dose limits for a member of the general public? What are they for a radiation worker?

I-125 vs Pd-103

Why would one use I-125 vs Pd-103 for prostate? What are the differences between them.