1. The carbon-14 activity of a fiber from an Egyptian mummy shroud is 7.50 disin
ID: 526804 • Letter: 1
Question
1. The carbon-14 activity of a fiber from an Egyptian mummy shroud is 7.50 disintegrations per minute per gram of carbon. How old is the fiber? The half-life of C-14 is 5730 years and the activity of fresh C-14 is 15.2 disintegrations per minute per gram of carbon. 5730 ST30 1.50 t 5, 40 2. Radon in a tube is often used in cervical cancer therapy. The halflife of a radioactive radon is 3.8 days. If 11 micrograms of radon are sealed in a tube, how many micrograms remain after 21 days? tih 3.4 days 3. How long will it take before the 11ug ofradon in the previous problem is reduced to 10 micrograms.Explanation / Answer
Q2.
HL = 3.8 days
A0 = 11 microg
Afinal = ?
apply half life equation
A = A0*(1/2)^(t/HL)
A = 11*(0.5)^(21/3.8)
A = 0.2386 mg left
Q3.
time for it in ordetr to reduce to 10^-6 microg
A = A0*(1/2)^(t/HL)
(10^-6) = (11)*(0.5)^(t/(3.8))
t = 3.8 * (ln((10^-6)/11) / ln(0.5))
t = 88.885 days
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