RAD-17

Absorbed dose

D = E / m. One gray is one joule per kilogram.

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DosimetryAbsorbed dose

Governing equation

D=E/m

where

E: Energy imparted (J)
m: Mass (kg)
D: Absorbed dose (Gy)

Lecture brief

Historical brief

Beer attenuation, Compton (1923), Klein–Nishina, Bragg–Gray cavity and KERMA are the transport of photons and charged particles in matter. The sheets compute fluence, kerma and stopping. This sheet (RAD-17 — Absorbed dose) is the form associated with Absorbed dose. Working symbols: $E$ , $m$ $\rightarrow$ $D$ . The fundamental stochastic-mean quantity of dosimetry. Everything else is a weighted D.

Purpose

Purpose: compute

D

from

E

m

in Radiation physics via

D=E/m

D = E / m. One gray is one joule per kilogram. Use it when a real radiation physics question must be answered in SI before a code check.

Live realistic example

In symbols

Live case. Given

E = 0.020\,\mathrm{J}

m = 1.000\,\mathrm{kg}

, the governing relation

D=E/m

yields

D = 0.0200\,\mathrm{Gy}

. A mass, an energy dump, a D. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

Energy imparted E0.02 JMass m1 kg

Outputs

Absorbed dose D0.0200 Gy

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Narration of this film

A mass, an energy dump, a D.

The fundamental stochastic-mean quantity of dosimetry. Everything else is a weighted D.

Reading speed

Watch on YouTube