(a) Find the energy absorbed by a 78-kg person who is...

(a) Find the energy absorbed by a 78-kg person who is exposed to 52 mrem of $\alpha$ particles with an RBE of $15 .$ (b) If the RBE of the $\alpha$ particles is increased, does the energy absorbed increase, decrease, or stay the same? Explain.

Key Concepts

Absorbed Dose

Absorbed dose is a measure of the energy deposited by ionizing radiation in a given mass of tissue. It is expressed in units such as the Gray (Gy), which represents one joule of energy absorbed per kilogram of material. This concept is fundamental in radiation physics as it quantifies the physical energy transfer regardless of the type of radiation involved.

Equivalent Dose

Equivalent dose is a derived quantity that adjusts the absorbed dose to reflect the potential biological damage caused by different types of radiation. Unlike the absorbed dose, it incorporates factors that account for the radiation's biological impact, using units such as the sievert (Sv) or rem. By incorporating weighting factors, the equivalent dose provides a more relevant measure of risk to living tissues.

Relative Biological Effectiveness (RBE)

Relative Biological Effectiveness (RBE) is a factor used to compare the biological damage produced by different types of ionizing radiation. It is defined as the ratio of the dose of a reference radiation (typically X-rays or gamma rays) to the dose of the radiation in question (such as alpha particles) needed to achieve the same biological effect. RBE is crucial in converting the physical absorbed dose into the equivalent dose, helping to assess the true biological risks associated with a given dose of radiation.

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