Icru Report 33 |work| (No Login)

This subtle change—defining fluence based on the cross-section of a sphere—solved geometrical issues regarding the angular distribution of radiation. It ensured that fluence could be defined unambiguously for radiation beams coming from any direction, which is vital for calculating intensity-modulated radiation therapy (IMRT).

These are subject to random fluctuations. They are necessary when looking at very small scales, such as radiation hitting a single cell or DNA strand. icru report 33

While absorbed dose is the quantity of interest for biological effects, remained a primary quantity for calibration standards. They are necessary when looking at very small

The number of particles flowing through a given area per unit of time. These describe how likely radiation is to interact

These describe how likely radiation is to interact with a specific medium (like air, water, or lead).

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