Fluorodeoxyglucose is a derivative of glucose that contains the radionuclide fluorine-18 18 F . A patient is given a sample of this material containing 300 MBq of 18 F (a megabecquerel is a unit of radioactivity). The patient then undergoes a PET scan (positron emission tomography) to detect areas of metabolic activity indicative of cancer. After 174 min, one-third of the original dose remains in the body. a. Write a function of the form Q t = Q 0 e − k t to model the radioactivity level Q t of fluorine-18 at a time t minutes after the initial dose. b. What is the half-life of 18 F ? Round to the nearest minute.
Fluorodeoxyglucose is a derivative of glucose that contains the radionuclide fluorine-18 18 F . A patient is given a sample of this material containing 300 MBq of 18 F (a megabecquerel is a unit of radioactivity). The patient then undergoes a PET scan (positron emission tomography) to detect areas of metabolic activity indicative of cancer. After 174 min, one-third of the original dose remains in the body. a. Write a function of the form Q t = Q 0 e − k t to model the radioactivity level Q t of fluorine-18 at a time t minutes after the initial dose. b. What is the half-life of 18 F ? Round to the nearest minute.
Solution Summary: The author analyzes the model for the quantity of radionuclide fluorine remaining in the patient's body at a time t minutes after being administered by using the exponential decay model.
Fluorodeoxyglucose is a derivative of glucose that contains the radionuclide fluorine-18
18
F
.
A patient is given a sample of this material containing 300 MBq of
18
F
(a megabecquerel is a unit of radioactivity). The patient then undergoes a PET scan (positron emission tomography) to detect areas of metabolic activity indicative of cancer. After 174 min, one-third of the original dose remains in the body.
a. Write a function of the form
Q
t
=
Q
0
e
−
k
t
to model the radioactivity level
Q
t
of fluorine-18 at a time t minutes after the initial dose.
b. What is the half-life of
18
F
? Round to the nearest minute.
Write the given third order linear equation as an equivalent system of first order equations with initial values.
Use
Y1 = Y, Y2 = y', and y3 = y".
-
-
√ (3t¹ + 3 − t³)y" — y" + (3t² + 3)y' + (3t — 3t¹) y = 1 − 3t²
\y(3) = 1, y′(3) = −2, y″(3) = −3
(8) - (888) -
with initial values
Y
=
If you don't get this in 3 tries, you can get a hint.
Question 2
1 pts
Let A be the value of the triple integral
SSS.
(x³ y² z) dV where D is the region
D
bounded by the planes 3z + 5y = 15, 4z — 5y = 20, x = 0, x = 1, and z = 0.
Then the value of sin(3A) is
-0.003
0.496
-0.408
-0.420
0.384
-0.162
0.367
0.364
Question 1
Let A be the value of the triple integral SSS₂ (x + 22)
=
1 pts
dV where D is the
region in
0, y = 2, y = 2x, z = 0, and
the first octant bounded by the planes x
z = 1 + 2x + y. Then the value of cos(A/4) is
-0.411
0.709
0.067
-0.841
0.578
-0.913
-0.908
-0.120
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