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Never. As a simple exponential-decay problem, it can get as small as you want if you're willing to wait long enough, but it never reaches zero.

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Q: Iodine 131 has a half life of 8 days. When will 10 lbs of iodine 131 not be radioactive anymore?
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What is the half life of radioactive iodine?

The answer is simple it is 8 days for iodine-131 but it depends on what isotope you are talking about

Is iodine in nuclear bombs?

No. However one of the fission products produced is Iodine-131 and it appears in the fallout. Iodine-131 is a dangerous beta and gamma emitter with a halflife of 8.05 days, it concentrates in the thyroid gland and can selectively kill it or cause cancers in it. Fortunately the halflife is only just over a week, because it then practically disappears in about 5 to 6 weeks. This allows Iodine-131 contaminated food and drink (e.g. fresh milk) to be stored and then safely used when the Iodine-131 has decayed. This also makes it possible to protect the thyroid gland by saturating it with ordinary Iodine (usually as potassium iodide pills) until the Iodine-131 has decayed.

How long would it take for iodine-131 to decay into xenon?

The half life of Iodine-131 is 8.02 days, that means that say if you had 1 gram of 131I after approximately 8 days there would be only 0.5g left. The other half would have become Xenon-131. After 6 half lives (~48 days in your case) you would only have 1.6% of the original amount left.

Iodine-131 is a radioactive isotope with a half-life of 8 days How many grams of a 64 g sample of iodine-131 will remain at the end of 24 days?

half life indicates in how much time half will be gone so in 8.07 half of the 5.0g will be gone leaving 2.5 then after another 8.07 half of the 2.5 will be gone and this will happen 5 times in 40.35 days (40.35/8.07) so it (1/2)^5 * 5g leaving 0.15625g

Does the formula for iodine change when it sublimes?

The actual "chemical formula does not, however this should help:-Iodine is a bluish-black, lustrous solid, volatilizing at ordinary temperatures into a blue-violet gas with an irritating odor.It forms compounds with many elements, but is less active than the other halogens, which displace it from iodides. Iodine exhibits some metallic-like properties.It dissolves readily in chloroform, carbon tetrachloride, or carbon disulpfide to form beautiful purple solutions. It is only slightly soluble in water.Iodine compounds are important in organic chemistry and very useful in medicine. Forty-two isotopes and isomers are recognized. Only one stable isotope, 127I, is found in nature.The artificial radioisotope 131I, with a half-life of 8 days, has been used in treating the thyroid gland. The most common compounds are the iodides of sodium and potassium (KI) and the iodates (KIO3). Lack of iodine is the cause of goiter. Iodides and thyroxin, which contains iodine, are used internally in medicine, and a solution of KI and iodine in alcohol is used for external wounds. The deep blue color with starch solution is characteristic of the free element.

Related questions

What is the half life of radioactive iodine?

The answer is simple it is 8 days for iodine-131 but it depends on what isotope you are talking about

How long does radioactive iodine stay in the body after a radioactive iodine thyroid treatment?

i think around 2 weeks but its safe to stay at an arms length after the firt 5-7 days but not with children probably

How much of an 80-milligram sample of Iodine-131 would be left after 32 days?

Iodine 131 is radioactive and has a half life of about 8 days. After 32 days there would be approximately 5 milligrams remaining

What happens to Iodine-125 brachytherapy seeds after decay?

Iodine-125 (53125I) decays by beta+ decay, with a half-life of 59.4 days, to tellurium-125 (52125Te), which is stable and non-radioactive.

What is the sample of the radioactive isotope 131I decays its half-life?

Iodine-131 has a half-life of about 8 days.

How is the patient prepared for an adrenal gland scan?

For two days before and ten days after the injection of the radiopharmaceutical, patients are given either Lugol's solution or potassium iodine. This prevents the thyroid from taking up radioactive iodine and interfering with the scan

Why did George HW Bush have to keep away from his family for several days?

He was being treated with radioactive iodine for Graves' disease.

Radioactive iodine-131 has a half-life of eight days. The amount of a 200.0 gram sample left after 32 days would be -?

12.5 g

What is the half life of Iodine 131?

8.02 days

What is the half life of iodine 125?

8.02 days

Is iodine -131 a more stable than barium -137?

Iodine 131 has a half-life of 8.0197 days. Barium has no half-life. So no, Iodine-131 is not more stable than barium-137.

How many days must elapse for a 0.80 Mg sample of iodine-131 in the thyroid to decay to 0.10 Mg?

The time required is 24.06 days. The half life of iodine 131 is 8.02 days.