A 60Co source with activity 2.5×10−4 Ci is imbedded in a tumor that has mass 0.480...
A 60Co source with activity 2.5×10−4 Ci is imbedded in a tumor that has mass 0.480 kg . The source emits γ photons with average energy 1.25 MeV. Half the photons are absorbed in the tumor, and half escape.
a) What energy is delivered to the tumor per second?
|
E = |
9.3×10−7 | J/s |
b) What absorbed dose (in rad) is delivered per second? D= 1.9×10−4 rad
c) What equivalent dose (in rem) is delivered per second if the RBE for these γ rays is 0.70?
|
D = |
1.3×10−4 | rem |
d) What exposure time is required for an equivalent dose of 150 rem ? Express your answer using two significant figures.
t= ____ days
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A 60Co source with activity 2.5×10−4 Ci is imbedded
in a tumor that has mass 0.480...
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Pease answer questions 4 and 5! Thank you so much!
4. Connect the 2nd resistor in parallel with the 1st
resistor and connect that combination to the battery.
Measure
the following:
The
current passing through the R1, I1 = ___0.0058____ A
The
current passing through the R2, I2 = ___0.0031____ A
The
current supplied by the battery, I = ___0.0092____ A
Calculate I1 + I2 = ____________ A
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