Question

The isotope 79Au198 (atomic mass 197.968 u) of gold, which has a half-life of 2.69 days, is used in cancer therapy. What mass (in grams) of this isotope is required to produce an activity of 393 Ci?

Answer #1

The iodine isotope 131 53 I (half-life = 8 days, atomic mass =
131 u) is used in hospitals for diagnosis of thyroid function. (1 u
= 1.66 x 10-27 kg). If 682 μg (1 μg = 10-6 g) are ingested by a
patient, determine the activity
(a) Immediately
(b) One hour later, when the thyroid is being tested
(c) Six months later (assume the iodine is still in the
patient’s body)

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...

The
radioactive isotope Gold-198 has a half-life of 64.80 hrs. A sample
containing this isotope has an initial activity of 40.0 μCi.
Calculate the number of nuclei that will decay in the time interval
from 10 hrs to 12 hrs.[10 marks]

One of the many isotopes used in cancer treatment is 79198Au,
with a half-life of 2.70 d. Determine the mass of this isotope that
is required to give an activity of 255 Ci. (answer in mg)

The half-life of 222Rn is 3.82 days.
(a) Convert the half-life to seconds.
s
(b) Calculate the decay constant for this isotope.
s?1
(c) Convert 0.650 ?Ci to the SI unit the becquerel.
Bq
(d) Find the number of 222Rn nuclei necessary to produce
a sample with an activity of 0.650 ?Ci.
222Rn nuclei
(e) Suppose the activity of a certain 222Rn sample is
6.20 mCi at a given time. Find the number of half-lives the sample
goes through in...

32P is a radioactive isotope with a half-life of 14.3 days. If
you currently have 30.9 g of 32P, how much 32P was present 4.00
days ago?
in grams

BIOPHYSICS
Cobalt-60 (60Co), is a synthetic radioactive isotope of cobalt
with a half-life of 5.2713 years. It is an isotope that emits gamma
rays essential to the medical community for cancer treatments, as
well as sterilization of medical devices. Cobalt-60 is used as a
radiation source for medical radiotherapy where it is used in
cancer treatment to control or kill malignant cells. Cobalt-60 is
used as the radiation source in Gamma Knife equipment that enables
non-surgical treatment of brain tumors....

35. Strotium−90, a radioactive isotope, is a major product of an
atomic bomb explosion. It has a half-life of 28.1 yr. (a) Calculate
the first-order rate constant for the nuclear decay. (b) Calculate
the fraction of 90Sr that remains after 10 half-lives. (c)
Calculate the number of years required for 92.3 percent of 90Sr to
disappear. (a) yr−1 (b) × 10 (c) × 10 yr
The activity of a radioactive sample is the number nuclear
disintegrations per second, which is...

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

The radioactive isotope which is often used for diagnosis and
imaging in nuclear medicine has a half-life of 3 days. What was the
initial mass of the isotope before decay, if the mass in 6 weeks
was 5g?

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