Radiation Budgets Through Space and Matter

Dose Is Deposited Energy per Mass

Dose is a physics ledger: deposited energy divided by mass. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

Dose is deposited energy per mass

Before shielding, 12 joules deposited in 3 kilograms gives 4 joules per kilogram.

12÷3=4 J/kg12\div3=4\ \mathrm{J/kg}
Dose ledgerDose is checked as deposited energy divided by mass.before E=12 Jafter E=3 Jmass=3 kgbefore dose=4 J/kgafter dose=1 J/kg

Shielding changes the deposited energy ledger

After shielding, 3 joules in the same 3 kilograms gives 1 joule per kilogram.

3÷3=1 J/kg3\div3=1\ \mathrm{J/kg}
Shielded dose ledgerThe lesson makes no medical risk claim.before E=12 Jafter E=3 Jmass=3 kgbefore dose=4 J/kgafter dose=1 J/kg

The final audit cites checked nuclear sources

The audit joins isotope, decay, half-life, binding, attenuation, and dose ledgers with accepted bit 1.

audit=1\mathrm{audit}=1
Nuclear audit ledgerEvery final value cites a checked source.isotopedecayhalf-lifebindingshieldingdoseaccepted1