 Question Video: Understanding the Factors Which Determine the Absorbed Dose of Nuclear Radiation | Nagwa Question Video: Understanding the Factors Which Determine the Absorbed Dose of Nuclear Radiation | Nagwa

# Question Video: Understanding the Factors Which Determine the Absorbed Dose of Nuclear Radiation Science

Which of the following statements correctly relates the exposure time of a person to a radioactive object, the rate at which the object emits nuclear radiation, and the absorbed radiation dose for the person? [A] The absorbed radiation dose will increase only if the exposure time increases. [B] The absorbed radiation dose will increase only if the rate of emission of nuclear radiation increases. [C] The absorbed radiation dose will increase if either the exposure time or the rate of emission of nuclear radiation increases.

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### Video Transcript

Which of the following statements correctly relates the exposure time of a person to a radioactive object, the rate at which the object emits nuclear radiation, and the absorbed radiation dose for the person? (A) The absorbed radiation dose will increase only if the exposure time increases. (B) The absorbed radiation dose will increase only if the rate of emission of nuclear radiation increases. (C) The absorbed radiation dose will increase if either the exposure time or the rate of emission of nuclear radiation increases.

This question is asking us about the radiation dose, or the total amount of nuclear radiation, absorbed by a person that is exposed to a radiation source. Let’s start by discussing the statement proposed by each answer option.

Option (A) mentions a correlation between absorbed radiation dose and exposure time. Now, it is true that the more time a person is exposed to radiation, the more radiation that person will absorb. However, it’s important to notice here the word “only.” While increased exposure time does increase the absorbed radiation dose, it’s definitely not the only factor that contributes to how much radiation is absorbed. Option (A) therefore cannot be correct.

Now, option (B) mentions a correlation between absorbed radiation dose and the rate of emission of nuclear radiation. It makes sense that if a person is near a source of radiation that has a greater rate of emission, then the person will receive a greater dose of radiation within the same period of time. Again, though, we should notice the word “only.” The rate of emission of nuclear radiation is not the only factor to take into consideration. After all, we’ve already seen that the dose will increase if the exposure time increases. So, we know that option (B) is not correct.

This leaves option (C), which says that both the exposure time and rate of emission of radiation are important. We’ve seen that increasing either the exposure time or the emission rate will increase the absorbed dose. We can therefore identify option (C) as being the correct answer. The absorbed radiation dose will increase if either the exposure time or the rate of emission of nuclear radiation increases.