RAD-30

Buildup factor

Scatter in broad beam.

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Radiationbuildup

Governing equation

I=B I_0 e^{-\mu x}

where

I_0: I0 (—)
B: Buildup (—)
\mu: μ (1/cm)
x: x (cm)
I: I (—)

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-30 — Buildup factor) is the form associated with buildup. Working symbols: $I_0$ , $B$ , $\mu$ , $x$ $\rightarrow$ $I$ . Scatter in broad beam.

Purpose

Purpose: compute

I

from

I_0

B

\mu

x

in Radiation physics via

I=B I_0 e^{-\mu x}

Scatter in broad beam. 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

I_0 = 1.000\,\mathrm{—}

B = 2.000\,\mathrm{—}

\mu = 0.150\,\mathrm{1/cm}

x = 10.000\,\mathrm{cm}

, the governing relation

I=B I_0 e^{-\mu x}

yields

I = 0.4463\,\mathrm{—}

. Scatter in broad beam. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

I0 I_01 —Buildup B2 —μ \mu0.15 1/cmx x10 cm

Outputs

I I0.4463 —

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Narration of this film

Scatter in broad beam.

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