Question

Radium has a 1620 year half-life and decriating to Radon with half-life 3,8 days. If the radium mass is 10 grams. Determine Radon produced after 24 hours in milicurie units

Answer #1

A) Radon gas has a half-life of 3.83 days. If 3.18 g of radon
gas is present at time t = 0, what mass of radon will
remain after 2.10 days have passed?
____ g
B) A drug tagged with 9943Tc (half-life =
6.05 h) is prepared for a patient. If the original activity of the
sample was 1.2 104 Bq, what is its activity
(R) after it has been on the shelf for 1.2 h?
_____Bq

Please explain procedure. The first-order decay of radon has a
half-life of 3.823 days. How many grams of radon remain after 7.22
days if the sample initially weighs 250.0 grams?

Radium decays exponentially; it has a half-life of 1,600 years.
Find a formula for the amount,
q(t),
remaining from 70 mg of pure radium after t years.
q(t) =
After how many years will there be 20 mg left? (Round your
answer to the nearest year.)
yr

Half life of radium is 1700 years, assuming that the decay rate
is proportional to the amount remaining. We initially have 5 grams
of radium.
a) Set up the IVP
b) Solve the IVP

A scientist puts 100 grams of radioactive radium having a
half-life of 1690 years into a concrete vault. What will be the
average amount of radium in the vault during the next 1400
years?

A sample of radioactive nuclei initially contains 6.00
×1010×1010 radon atoms. The half-life of this type of nucleus is
500 days. How many nuclei have decayed after 167 days?
A sample of radioactive nuclei initially contains
6.00 radon atoms. The half-life of this type of nucleus
is 500 days. How many nuclei have decayed after 167 days?
2.00×1010
4.00×1010
1.24×1010
4.76×1010

An isotope of gallium, 67Ga, has an atomic number of 31 and a
half-life of 78 hours. Consider a small mass of 3.4 grams for 67Ga
which is initially pure.
1. Initially, what is the decay rate of the gallium? Ro =
2. What is the half-life of the gallium after 24 hours? T1/21
=
3. Initially, what is the initial decay constant of the Ga atoms
after 24 hours?
4. λ1 = What is the decay rate of the...

Bismuth-210 has a half-life of 5.0 days. (a) A sample originally
has a mass of 800 mg.
Find a formula for the mass remaining after t days. y(t) =
(b) Find the mass remaining after 10 days. mg
(c) When is the mass reduced to 1 mg? (Round your answer to the
nearest day.)

A sample of radioactive nuclei initially contains 9.00 ×1010
radon atoms. The half-life of this type of nucleus is 450 days. How
many nuclei have decayed after 150 days?
OPTIONS:
7.14×1010
6.00×1010
3.00×1010
1.86×1010

Strontium-90 has a half-life of 28 days.
A) A sample has a mass of 75 mg initially. Find a formula for
the mass remaining after t days.
B) Find the mass remaining after 40 days.
C) Find the rate of decay equation after t days.

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