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Damage to healthy tissue is unavoidable.
Symptoms of radiation sickness include nausea, loss of hair, and so on.
The material must be removed after a period of time.
Gold 198 with a half-life of about 3 days, is a short-lived isotope that decays quickly so that it doesn't need to be removed after treatment.
Specific organs tend to be the focus of certain elements introduced into the body by injection or mouth.
This phenomenon can be used in radiation therapy.
The bone marrow is home to the radioactive isotope phosphorus 32.
Iodine 131 is given for the treatment of hyperthyroidism.
A beam of X-rays can be used to destroy tumors.
The treatment is done without surgery.
Changing the direction of the beam passing through the body can reduce the effect of radiation on healthy tissue.
The tumor is always in the path of the beam, but the dosage received by a section of healthy tissue is reduced.
All foods decay quickly without some attempt at preservation.
Many foods become inedible within a day or two.
The decay is caused by organisms that break down the food.
A number of techniques have been developed over the years.
The rate of activity for the organisms decreases when the food is kept in a cold environment.
For a period of time, heating the food retards decay.
The methods of retarding spoilage are at least 100 years old.
There is a new method of preserving food.
The food is destroyed by high-energy radiation.
Small insects that attack stored foods can be destroyed with radiation.
Wheat and other grains are often fumigated before shipping or storage.
The insects are not killed by chemical fumigation.
New insects may destroy a lot of the grain when they hatch.
The insects and eggs are killed by radiation.
In food preservation, the most used rays are the gantries.
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