Radiation Dosage and Energy Absorbed by 69 kg Patient

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Alpha particles with an RBE of 13 deliver a 32 mrad whole-body radiation dose to a 69 kg patient, prompting questions about the equivalent dosage in rem and the energy absorbed. Participants in the discussion clarify that a rad is a unit of absorbed radiation dose and that mrad refers to milli-rads. The concept of Relative Biological Effectiveness (RBE) is discussed, emphasizing its role in comparing the biological effects of different types of radiation. Understanding these terms is essential for solving the problem posed. The conversation highlights the importance of foundational knowledge in radiation dosimetry for accurate calculations.
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Alpha particles with an RBE of 13 deliver a 32 mrad whole-body radiation does to a 69 kg patient.

A) What dosage, in rem, does the patient receive?

B) How much energy is absorbed by the patient?

Can anyone help me with this problem? Stuck from the beginning..
 
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Hi keweezz,

A good place to start would be to define the terms. What is a rad? What does RBE mean, and how is it used?
 
Radiobiological Effectiveness for RBE i believe..and mrad is a unit like a millimeter.
 
keweezz said:
Radiobiological Effectiveness for RBE i believe..and mrad is a unit like a millimeter.

Yes, a mrad is a milli-rad. But my questions was, what is a rad? Answering that will allow you to get half the problem done.

I think RBE stands for relative biological effectiveness; but those are just the words. How is the RBE factor used?
 
hm.. how is it used..? any thoughts?
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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