Why is the biological half life of a radioisotope shorter than physical half life?

Answer 1

The human body has a number of mechanisms for removing toxic materials, almost all of which are much faster than the radioactive decay of that material.

For example, radioactive isotopes can be scrubbed from the bloodstream in the liver & kidneys, and excreted through the urinary tract. Ingested radioactive isotopes are passed out through defecation.

Answer 2

This is a very good ?. I think it is also a COMPLEX ?. Nature has instilled in us 'anger'. Anger comes when we feel we have been slighted. Everyone's anger point is different & usually mellows with age as long as we are in constant contact with other human beings. Anger helps us survive when we feel threatened. How we use that anger is the key point in using our emotions effectively & our own survival depends on appropriately using our anger. If we use anger in an appropriate way--like starting a charitable organization or making a public speech about what angered us--the emotion of anger is a great thing that can be beneficial to us & society as a whole. But sometimes we act in a rash manner when we get angry. We lash out instead of finding a good resolution to the problem. Riots & gang violence are negative ways we use our violence that sets us back many years & ultimately, decreases the chances of our species survival. Now when it comes immediate violence, the lines get blurry very quickly. When someone strikes out at us physically, we immediately get on the defensive & oftentimes lash back. We don't even have time to THINK if the violence was life-threatening or not. But I DO believe that you should not dish out what you cannot take in return. Scenario: I don't care if you are a 99-pound woman. You have NO right hitting a man. A 99-pound man would be ostracized for hitting a woman. I think there should be no discrimination when it comes to this.

Answer 3

This is not true. Please see table of effective half life where you can see that this is not true.