RAD-26

Absorbed dose

Gray = J/kg.

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Radiationabsorbed dose

Governing equation

D=\varepsilon/m

where

\varepsilon: Energy deposited (J)
m: Mass (kg)
D: 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-26 — Absorbed dose) is the form associated with absorbed dose. Working symbols: $\varepsilon$ , $m$ $\rightarrow$ $D$ . Gray = J/kg.

Purpose

Purpose: compute

D

from

\varepsilon

m

in Radiation physics via

D=\varepsilon/m

Gray = J/kg. 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

\varepsilon = 0.010\,\mathrm{J}

m = 0.500\,\mathrm{kg}

, the governing relation

D=\varepsilon/m

yields

D = 0.020000\,\mathrm{Gy}

. Gray = J/kg. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

Energy deposited \varepsilon0.01 JMass m0.5 kg

Outputs

Dose D0.020000 Gy

Reading speed

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Narration of this film

Gray = J/kg.

Reading speed

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