BIO Food Irradiation. Food is often irradiated with either x...

BIO Food Irradiation. Food is often irradiated with either $x$ rays or electron beams to help prevent spoilage. A low dose of $5-75$ kilorads (krad) helps to reduce and kill inactive parasites, a medium dose of $100-400$ krad kills microorganisms and pathogens such as salmonella, and a high dose of $2300-5700$ krad sterilizes food so that it can be stored without refrigeration. (a) A dose of 175 krad kills spoilage microorganisms in fish. If $x$ rays are used, what would be the dose in Gy, Sv, and rem, and how much energy would a $220-\mathrm{g}$ portion of fish absorb? (See Table $43.3 . )$ (b) Repeat part (a) if electrons of RBE 1.50 are used instead of x rays.

BIO Food Irradiation. Food is often irradiated with
either $x$ rays or electron beams to help prevent spoilage. A low
dose of $5-75$ kilorads (krad) helps to reduce and kill inactive parasites, a medium dose of $100-400$ krad kills microorganisms and
pathogens such as salmonella, and a high dose of $2300-5700$ krad
sterilizes food so that it can be stored without refrigeration. (a) A
dose of 175 krad kills spoilage microorganisms in fish. If $x$ rays are
used, what would be the dose in Gy, Sv, and rem, and how much
energy would a $220-\mathrm{g}$ portion of fish absorb? (See Table $43.3 . )$
(b) Repeat part (a) if electrons of RBE 1.50 are used instead of
x rays.

Key Concepts

Food Irradiation

Food irradiation is the process of exposing food to controlled amounts of ionizing radiation, such as X rays or electron beams, to eliminate spoilage organisms, parasites, and harmful pathogens. This technique enhances food safety and extends shelf life without invoking heat or chemical treatments.

Radiation Dose Units

Radiation dose units, including rad, gray (Gy), sievert (Sv), and rem, quantify the amount of energy deposited in a substance by ionizing radiation. Understanding these units is essential in translating doses between different measurement systems, enabling accurate assessments of both physical energy deposition and potential biological effects.

Dose Conversion

Dose conversion is the process of using appropriate conversion factors to translate radiation doses from one unit to another. This is crucial for comparing treatments and ensuring that dosages applied in practices like food irradiation meet safety and efficacy standards.

Relative Biological Effectiveness (RBE)

Relative Biological Effectiveness (RBE) compares the biological impacts of different types of radiation. It adjusts the nominal physical dose by accounting for differences in how various radiations interact with biological tissues, ensuring that the effective dose reflects the true potential for biological damage.

Energy Absorption Calculations

Energy absorption calculations involve determining the total energy deposited in an object or substance as a result of a given radiation dose. In the context of food irradiation, these calculations link the absorbed dose with the mass of the food to quantify the overall energy uptake, which is key for validating the effectiveness of microbial or parasitic inactivation.

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