RAD-31

Exposure X

Legacy, air ionisation.

Reading speed

Radiationexposure

Governing equation

X=Q/m_{\mathrm{air}}

where

Q: Charge (C)
m: Air mass (kg)
X: Exposure (C/kg)

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-31 — Exposure X) is the form associated with exposure. Working symbols: $Q$ , $m$ $\rightarrow$ $X$ . Legacy, air ionisation.

Purpose

Purpose: compute

X

from

Q

m

in Radiation physics via

X=Q/m_{\mathrm{air}}

Legacy, air ionisation. 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

Q = 1.000e-6\,\mathrm{C}

m = 0.001\,\mathrm{kg}

, the governing relation

X=Q/m_{\mathrm{air}}

yields

X = 0.001000\,\mathrm{C/kg}

. Legacy, air ionisation. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

Charge Q0.000001 CAir mass m0.001 kg

Outputs

Exposure X0.001000 C/kg

Reading speed

Watch on YouTube

Free library

Full library

Free PDF / open book

YouTube channels

00:0 / 00:08

Narration of this film

Legacy, air ionisation.

Reading speed

Watch on YouTube