Question

Plutonium-239 has a half-life of 24,000 years and an atomic mass of 239.05 u. When it decays to Uranium-235 an alpha particle with an energy of 5.2 MeV is released.

a. How many atoms of are there in one tonne of the materia

b. After 48,000 years how many atoms of are there left?

c. How much energy in Joules has been released in the radioactive decays of the plutonium

Answer #1

Plutonium-239 has a half-life of 24,000 years and an atomic mass
of 239.05 u. When it decays to Uranium-235 an alpha particle with
an energy of 5.2 MeV is released.
How many atoms of are there in one tonne of the material.
[10 pts]
After 48,000 years how many atoms of are there left? [5
pts]
How much energy in Joules has been released in the radioactive
decays of the plutonium. [10 pts]

Plutonium-239 is one of the major isotopes used in nuclear
reactors and nuclear weapons.
It has a half-life of 24,100 years.
a.) how many alpha and beta decays are needed for 239/94PU to
decay 227/89Ac?
b.) Calculate the kinetic energy released from the alpha decay
of s39/94Pu. Compare this to the
kinetic energy released by the fission reaction.
n + 239/94 Pu-->100/40 Zr + 137/54 Xe + 3n

Plutonium-239 can be used to make nuclear weapons and is found
in nuclear waste, but radioactive waste from nuclear reactors
contains large amounts of undesirable contaminants. Radioactive
waste can be stored in deep geological storage. Over many years the
fission products decay, decreasing the radioactivity of the waste.
However, the undesirable contaminant Pu-240 decays faster than the
Pu-239, and thus the quality of the bomb material increases with
time. In order for weapons grade plutonium to be obtained the
sample...

Uranium (U) has a mass number of 238 and an atomic number of 92
and decays by emission of an alpha particle. The product of this
decay is (Points : 5)
A.) uranium (U), with a mass number of 234 and an atomic number
of 92.
B.) lead (Pb), with a mass number of 234 and an atomic number of
91.
C.) thorium (Th), with a mass number of 234 and an atomic number
of 90.
D.) radium (Ra), with...

The half life of Uranium-235 is 704 million years, yet it is
unstable and naturally decays by alpha particle emission and can
also undergo spontaneous fission. What is the binding energy per
nucleon for the Uranium-235 and how does its binding energy per
nucleon compare to that of the stable Carbon-12 nucleus that is
ubiquitously present in biological systems? See the worked example
for Carbon-12 shown in your lecture notes that is found throughout
the human body as well as...

The radioactive plutonium isotope, 239Pu, has an half-life of 24
100 years and undergoes alpha decay. The molar mass of 239Pu is
239.0521634 amu. The sample initially contains 10.0 g of 239Pu.
(a) Calculate the number of moles of 239Pu that are left in the
sample after 15 000 years. (4)
(b) Determine the activity of 239Pu after 15 000 years, in units
of Bq.

The radioactive plutonium isotope, 239Pu, has an
half-life of 24 100 years and undergoes alpha decay. The molar mass
of 239Pu is 239.0521634 amu. The sample initially
contains 10.0 g of 239Pu. (a) Calculate the number of
moles of 239Pu that are left in the sample after 15 000
years. (4) (b) Determine the activity of 239Pu after 15
000 years, in units of Bq.

The
radioactive nuclide Plutonium-199 has a half-life of 43.0 min. A
sample is prepared that has an initial activity of 7.56 ×1011 Bq.
i. How many Plutonium-199 nuclei are initially present in the
sample?
ii. How many are present after 30.8 min?
iii. What is the activity at this time?

An element has an atomic mass 135.887u. This element is unstable
and decays by alpha decay, (α), with a half-life of 6.7days. The
alpha particle is emitted with a kinetic energy of 2.8MeV.
Determine the fraction present after 49.8hrs.

Uranium 238 is the most common isotope of Uranium. It has an
atomic mass of 238.05 and a half-life of 4.47x109 yrs. Imagine a
probe that contains 100 g of 238U . What is the activity of this
probe due to the radioactive decay of 238U alone? (c) How
many nuclei of 238U will be left in the above probe after 109
yrs?

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