Kit Library / Food Science and Technology / Food Preservation Technology

⚡ Topic Learning Kit

Food Irradiation

English 55 leveled MCQs 16 flashcards 6 games Free

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💡 Key Idea

Three Radiation Processes, Three Dose Ranges

Dose decides the destiny.

Food irradiation is classified into three processes based on the radiation dose applied. Radappertization (30-40 kGy) destroys microorganisms for sterility. Radicidation (2.5-10 kGy) reduces non-spore-forming pathogens. Radurization (0.75-2.5 kGy) reduces spoilage organisms to extend shelf life.

↳ Higher dose means stronger microbial kill; each process targets a different goal.

📖 Definition

What Are X-rays?

Electrons smash metal, X-rays emerge.

X-rays are ionizing radiations produced by bombarding a suitable metal target with high-velocity electrons. In their behaviour, they are similar to Gamma rays.

↳ X-rays are ionizing radiations generated by electron bombardment of a metal target.

➗ Formula

REP Unit: Roentgen-Equivalent Physical

83 ergs per gram.

↳ 1 REP equals absorption of 83 ergs per gram of matter.

📖 Smart notes

What you'll study, topic by topic

1

Food Irradiation: Radiation Units, Processes and Effects

Food irradiation uses ionizing radiation to preserve food through three processes: radappertization (sterilization), radicidation (pathogen reduction), and radurization (shelf-life extension). Radiation dose is measured…

  • Radappertization (30-40 kGy) achieves sterility; radicidation (2.5-10 kGy) reduces pathogens; radurization (0.75-2.5 kGy) extends shelf life…
  • 1 Gray = 100 rads = 1 joule/kg; 1 kGy = 10^5 rads.
  • 1 REP = 83 ergs/g; 1 RAD = 100 ergs/g.

~8 min · full explanation, examples & memory tricks in the app

❓ Leveled MCQ practice

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55 questions laddered from warm-up to topper-level, each with an explanation. A taste:

X-rays used in food irradiation are produced by bombarding a suitable metal target with:

Beginner
A Gamma rays B High velocity electrons C Low velocity neutrons D Ultraviolet photons
Show answer & explanation

High velocity electrons

X-rays are ionizing radiations produced by bombarding a suitable metal target with high velocity electrons, and they behave like Gamma rays.

Which unit represents the absorption of 83 ergs per gram of matter?

Intermediate
A REP B RAD C Gray D Krad
Show answer & explanation

REP

1 REP (Roentgen-Equivalent Physical) equals absorption of 83 ergs/g of matter, whereas 1 RAD equals 100 ergs/g.

1 Gray (Gy) is equal to how many rads?

Beginner
A 10 rads B 1000 rads C 83 rads D 100 rads
Show answer & explanation

100 rads

The Gray is a newer unit of radiation where 1 Gray = 100 rads = 1 joule/kg.

Which radiation process is equivalent to commercial sterility of heat processed foods?

Intermediate
A Radappertization B Radurization C Pasteurization D Radicidation
Show answer & explanation

Radappertization

Radappertization destroys microorganisms and is equivalent to commercial sterility of heat processed foods, also called radiation sterilization.

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