Question

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 ^{99}_{43}Tc (half-life =
6.05 h) is prepared for a patient. If the original activity of the
sample was 1.2 10^{4} Bq, what is its activity
(*R*) after it has been on the shelf for 1.2 h?

_____Bq

Answer #1

- The above problem is related to decay of material after some time.
- All the necessary steps are clearly mentioned and easy to understand.
- Hope the answer will help you. Thank you for your support.

Please explain procedure. The first-order decay of radon has a
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Radon is a radioactive colorless, odorless gas that is produced
in thorium and uranium decay chains. Its half-life is 3.8 days.
Typical domestic exposures are approximately 100 Bq/m3
in buildings and 10 Bq/m3outdoors. What would the
concentration be in Ci/m3 and approximately how many
days would it take for an air sample taken indoors to be equivalent
in activity to typical outdoor activity concentrations?

The half-life of 199Au is 3.14 days.
a.)Convert the half-life to units of seconds.
b.) What is the decay constant (in s−1) for this
isotope?
c.) Suppose a sample of 199Au has an activity of
0.360 µCi. What is this activity expressed in the SI unit of
becquerels (Bq)?
d.) Suppose a sample of 199Au has an activity of
0.360 µCi. What is this activity expressed in the SI unit of
becquerels (Bq)?
e.) Now suppose that a new sample...

The
radioactive nuclide Plutonium-199 has a half-life of 43.0 min. A
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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?

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30 g of substance X remain from original sample of 240 g after 300
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A radioactive sample contains 2.94 μg of pure11C, which has a
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a) How many moles of 11C is present ini- tially? The value of
Avogadro’s number is
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b) Find the number of nuclei present initially. Answer in units
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c)Find the initial activity of the sample. Answer in units of
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d)Find the activity of the sample after 6.97 h. Answer in units
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Q(t) =
What amount will be left after 17.6 days? (Round your answer to
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(b) Determine the activity of 239Pu after 15 000 years, in units
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