Iodine 131 is radioactive and has a half life of about 8 days.
After 32 days there would be approximately 5 milligrams remaining
If a sample of radioactive material has a half-life of one week the original sample will have 50 percent of the original left at the end of the second week. The third week would be 25 percent of the sample. The fourth week would be 12.5 percent of the original sample.
Iodine-131 has a half-life of about 8 days.
Hi, Each half-life means the mass of the sample has decreased by 1/2 its mass. Thus; After 1 half-life, 1/2 the sample has decayed. After 2 half-lives 3/4 of the sample has decayed. Hope this helps.
its 100
18 days
The mass is 1,075 g.
12.5 g
The mass is 1,075 g.
240
18 days
Thorium-234 has a half-life of 24.1 days. How much of a 100-g sample of thorium-234 will be unchanged after 48.2 days?
5.0 mg is the total mass of 222Rn remaining in an original 160-milligram sample of 222Rn after 19.1 days.
18 grams are one fourth of the original sample mass of 72 grams. Accordingly, the half life is 6.2/4 = 1.55 days.
The number of days is 96,4.
After 48,2 days the amount of Th-234 will be 25 g.
10.76 days
The answer depends on 3240 WHAT: seconds, days, years?