RPR-04

ICRP neutron wR(E)

wR(E) from ICRP 103. Photons and electrons are 1; α is 20.

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QuantitiesICRP 103 wR

Governing equation

w_R(E)=2.5+18.2\,e^{-(\ln E)^2/6}\ (E<1\,\mathrm{MeV})

where

E: Neutron energy (MeV)
w_R: Radiation weighting factor (—)

Lecture brief

Historical brief

Inverse-square, half-value layer, ICRP weighting and ALARA are the protection craft since the 1920s commissions. The lab computes transmission, equivalent dose and a shielding snapshot. This sheet (RPR-04 — ICRP neutron wR(E)) is the form associated with ICRP 103 wR. Working symbols: $E$ $\rightarrow$ $w_R$ . A continuous log-Gaussian in neutron energy. Peak wR sits near 1 MeV.

Purpose

Purpose: compute

w_R

from

E

in Radiation protection via

w_R(E)=2.5+18.2\,e^{-(\ln E)^2/6}\ (E<1\,\mathrm{MeV})

wR(E) from ICRP 103. Photons and electrons are 1; α is 20. Use it when a real radiation protection question must be answered in SI before a code check.

Live realistic example

In symbols

Live case. Given

E = 1.000\,\mathrm{MeV}

, the governing relation

w_R(E)=2.5+18.2\,e^{-(\ln E)^2/6}\ (E<1\,\mathrm{MeV})

yields

w_R = 20.69\,\mathrm{—}

. A neutron energy slider and a wR bar. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

Neutron energy E1 MeV

Outputs

Radiation weighting factor w_R20.69 —

Reading speed

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Narration of this film

A neutron energy slider and a wR bar.

A continuous log-Gaussian in neutron energy. Peak wR sits near 1 MeV.

Reading speed

Watch on YouTube