RPR-23

Annual limit on intake

ALI = 0.020 Sv / e(50). Intake that commits 20 mSv.

Reading speed

InternalICRP ALI

Governing equation

\mathrm{ALI}=0.020/e(50)

where

e(50): Committed coefficient e(50) (nSv/Bq)
ALI: Annual limit on intake (MBq)

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-23 — Annual limit on intake) is the form associated with ICRP ALI. Working symbols: $e(50)$ $\rightarrow$ $ALI$ . The 20 mSv is the ICRP occupational effective-dose limit (averaged over 5 years, with 50 mSv in any year). Non-stochastic ALIs used hT = 500 mSv.

Purpose

Purpose: compute

ALI

from

e(50)

in Radiation protection via

\mathrm{ALI}=0.020/e(50)

ALI = 0.020 Sv / e(50). Intake that commits 20 mSv. 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(50) = 20.000\,\mathrm{nSv/Bq}

, the governing relation

\mathrm{ALI}=0.020/e(50)

yields

ALI = 1.000\,\mathrm{MBq}

. A dose coefficient inverted into a Bq budget. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

Committed coefficient e(50) e(50)20 nSv/Bq

Outputs

Annual limit on intake ALI1.000 MBq

Reading speed

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Narration of this film

A dose coefficient inverted into a Bq budget.

The 20 mSv is the ICRP occupational effective-dose limit (averaged over 5 years, with 50 mSv in any year). Non-stochastic ALIs used hT = 500 mSv.

Reading speed

Watch on YouTube