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This varies significantly depending on the dosage received and the individual's response to the poisoning. There are different scales for use in measuring the dosage. One commonly used measurement of the radiation absorbed dose of Roentgens in humans or other mammals is REMs (Roentgen Equivalent Man/Mammal). If you use these units in association with the Gray Scale, then 100 REMs = 1 GY on the Gray Scale.

Early symptoms of radiation poisoning include nausea and vomiting, diarrhea, headache, fever, and abnormal central nervous system (CNS) function. These will usually appear within hours of exposure of larger doses. Increasing doses increase the severity of these symptoms and shorten the timeframes of the progression of the symptoms to morbidity and mortality.

Exposure of humans to:

1-2 GY:

Results in a mild expression of the above symptoms and usually no deaths, but can dramatically increase the potential for long term effects, such as cancer or genetic damage, as do all the following exposures.

2-6 GY:

Results in slightly more severe early symptoms, and up to 50% mortality in seven to twenty-eight days.

6-8 GY:

Results in severe symptoms within 3 - 4 hours such as diarrhea, nausea and vomiting, very high fever, severe headache and 100% mortality in less than seven days.

8-30 GY:

Results in very severe symptoms in less than 10 minutes, rapid incapacitation and CNS involvement with 100% mortality within 2 hours of exposure.

30 GY and over:

Results in seizures and tremors and 100% mortality in under 30 minutes.

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How long does it take for radiation sickness symptoms to appear?

If it is a major overexposure, a few days or a week perhaps. Small overdoses may take years to produce any effect, then it may be argued these are just effects of ageing or exposure to chemicals etc. Radiation sickness is therefore reserved for sickness arising due to known massive overdoses.


What is radioactive half-life used for?

Radioactive half-life is used to measure the rate at which a radioactive substance decays. It is important in determining the amount of time it takes for half of a radioactive substance to decay into a stable form. This information is useful in various fields such as medicine, environmental science, and geology for dating purposes and evaluating risks associated with radioactive materials.


If the half-life of a radioactive substance is 10 hours how long will it take for 50 percent of it to decay?

The half-life of a radioactive isotope is defined as the time taken for the isotope to decay to half of its initial mass. So to decay to 50 percent of its initial mass will take one half-life of the isotope. One half-life of the isotope is 10 hours so the time taken to decay is also 10 hours.


When an atom undergoes radioactive decay when does it become a completely different element?

An atom of a given isotope will undergo radioactive decay whenever it feels like it. No joke. The nucleus of a radioactive isotope is unstable. Always. But that atom has no predictable moment of instability leading immediately to the decay event. We use something called a half life to estimate how long it will take for half a given quantity of an isotope to undergo radioactive decay until half the original amount is left, but this is a statistically calculated period. No one knows how long it will take a given atom of a radioactive isotope to decay, except that those with very short half lives will pretty much disappear relatively quickly.


What is the meaning of radioactive as a safety symbol?

The "radioactive" safety symbol warns you that radioactive material or a radiation producing machine is near the symbol and you should take precautions to ensure that you are not unnecessarily exposed to ionizing radiation.

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