Which of the following statements is true about dose calculation?

The statement indicating that the intensity of radiation decreases with distance is grounded in the principles of radiation physics, particularly the inverse square law. As the distance from a radiation source increases, the intensity of the radiation (or dose rate) experienced by a person or a detector diminishes because the radiation spreads out over an increasingly large area. This relationship is crucial for understanding how radiation behaves in different environments and helps in accurately calculating doses received from various sources of radiation.

In practical terms, when assessing exposure to radiation, it is vital to consider the distance from the source. As a person moves further away from the source, the radiation dose decreases significantly, which is an important factor in radiation safety protocols and dose management. Therefore, this knowledge is essential for those involved in radiation protection and dose calculations, as it impacts how we design shielding and establish safety guidelines.

The other statements do not hold true under scrutiny. For example, the idea that dose is independent of time overlooks the fact that dose accumulation is contingent upon both the rate of exposure and the duration of that exposure. The concept of subtracting rates to find the dose is not a standard calculation in radiation dose assessment. Lastly, the total dose being constant regardless of time contradicts the cumulative nature of dose, as