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Index/Nuclear medicine/NMD-35

NMD-35

Tc-99m remaining

T½ = 6 h.

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Nuclear medicineTc-99m

Governing equation

A=A02−t/6mathrmhA=A_0 2^{-t/6\\mathrm{h}}

where

A_0
A0 (MBq)
t
t (h)
A
A (MBq)

Lecture brief

Historical brief

MIRD schema, in-vivo decay, uptake fractions and PET coincidence turned unsealed sources into organ dose. The sheets compute activity, residence and well-counter geometry. This sheet (NMD-35 — Tc-99m remaining) is the form associated with Tc-99m. Working symbols: A0A_0, tt →\rightarrow AA. T½ = 6 h.

Purpose

Purpose: compute AA from A0A_0, tt in Nuclear medicine via A=A02−t/6mathrmhA=A_0 2^{-t/6\\mathrm{h}} T½ = 6 h. Use it when a real nuclear medicine question must be answered in SI before a code check.

Live realistic example

In symbols

Live case. Given A0=800.000 MBqA_0 = 800.000\,\mathrm{MBq}, t=6.000 ht = 6.000\,\mathrm{h}, the governing relation A=A02−t/6mathrmhA=A_0 2^{-t/6\\mathrm{h}} yields A=400.0 MBqA = 400.0\,\mathrm{MBq}. T½ = 6 h. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

Outputs

  • A A400.0 MBq
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NMD-35 · decay
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Narration of this film

T½ = 6 h.

T½ = 6 h.

Reading speed

Watch on YouTube