Question

If a tech stands 2 ft from a radioactive source and recieved 1 mrem/hr from it, what will he absorb by stepping 1 ft closer to the source?

a. 0.25 mrem/hr
b. 1.5 mrem/hr
c. 2.0 mrem/hr
d. 4.0 mrem/hr

Answer 1

The absorbed dose will increase by 4 times when the tech moves 1 ft closer to the radioactive source.

Step-by-step explanation:

To determine the absorbed dose when the tech moves 1 ft closer to the radioactive source, we need to consider the inverse square law. According to this law, the intensity of radiation is inversely proportional to the square of the distance from the source.

So, if the tech moves 1 ft closer, the distance becomes 1 ft and the intensity of radiation increases by (2/1)^2 = 4 times. Therefore, the tech will absorb 4 times the initial dose, which is 1 mrem/hr * 4 = 4 mrem/hr.

Therefore, the correct answer is d. 4.0 mrem/hr.