The periodreactor period during which the quantity of a radionuclideUnstable nuclide spontaneously decaying without external eff... in a biological system is reduced by half by interactionInfluence of a physical body on another body or the coupling... of radioactive decayThe spontaneous conversion of a nuclide into another nuclide... and excretion due to biological processes.
T phys: physica half-lifeThe period during which half of the nuclei decay in a quanti...
Tbiol: biological half-lifeThe period during which half of the nuclei decay in a quanti...
The table indicates the physical, biological and resulting determined effective half-lifeThe period during which half of the nuclei decay in a quanti... of some radionuclides for adults.
| Nuklid |
Physical
half-lifeThe period during which half of the nuclei decay in a quanti... |
Biological
half-lifeThe period during which half of the nuclei decay in a quanti... |
Effektive
half-lifeThe period during which half of the nuclei decay in a quanti... |
| TritiumRadioactive isotope of hydrogen with two neutrons and a prot... |
12.3 a
|
10 d
|
10 d
|
| Iodine-131 |
8 d
|
80 d
|
7.2 d
|
| Caesium-134 |
2.1 a
|
110 d
|
96 d
|
| Caesium-137 |
30.2 a
|
110 d
|
109 d
|
| Plutonium-239 |
24,100 a
|
50 a
|
49.9 a
|
Half-lives for some radionuclides