Prepositions - Despite/In Spite Of

Prepositions - Despite/In Spite Of

1. Despite indicates an illogical occurrence.
We had a good time despite the bad weather.

2. In spite of has the same meaning and usage as despite.
We had a good time in spite of the bad weather.

Prepositions - About

Prepositions - Above

Prepositions - Across

Prepositions - After

Prepositions - Against

Prepositions - Ahead Of

Prepositions - Along

Prepositions - Among

Prepositions - Around

Prepositions - As

Prepositions - At

Prepositions - Back to/Back From

Prepositions - Before

Prepositions - Behind

Prepositions - Below

Prepositions - Beneath

Prepositions - Beside

Prepositions - Besides

Prepositions - Between

Prepositions - Beyond

Prepositions - But

Prepositions - By

Prepositions - Close To

Prepositions - Despite/In Spite Of

Prepositions - Down

Prepositions - During

Prepositions - Except

Prepositions - Far From

Prepositions - For

Prepositions - From

Prepositions - In

Prepositions - In Back Of

Prepositions - In Front Of

Prepositions - Inside

Prepositions - Instead Of

Prepositions - Into

Prepositions - Like

Prepositions - Near

Prepositions - Next To

Prepositions - Of

Prepositions - Off

Prepositions - On

Prepositions - On Top Of

Prepositions - Onto

Prepositions - Opposite

Prepositions - Out

Prepositions - Outside

Prepositions - Over

Prepositions - Past

Prepositions - Through

Prepositions - Throughout

Prepositions - To

Prepositions - Toward

Prepositions - Towards

Prepositions - Under

Prepositions - Underneath

Prepositions - Until

Prepositions - Up

Prepositions - With

Prepositions - Within

Prepositions - Without

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Photoelectric absorption

The probability of a photoelectric absorption per unit mass is approximately proportional to Z3/E3, where Z is the atomic number and E is the energy of the incident photon. This rule is not valid close to inner shell electron binding energies where there are abrupt changes in interaction probability, so called absorption edges. However, the general trend of high absorption coefficients and thus short penetration depths for low photon energies and high atomic numbers is very strong. For soft tissue photoabsorption dominates up to about 26 keV photon energy where Compton scattering takes over. For higher atomic number substances this limit is higher. The high amount of calcium (Z=20) in bones together with their high density is what makes them show up so clearly on medical radiographs.