Food is often irradiated with the use of either x rays or electron beams, to hel
ID: 1400078 • Letter: F
Question
Food is often irradiated with the use of 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: If electrons of RBE 1.50 are used instead of x rays, what would be the dose in Gy
B: What would be the dose in Sv ?
C:What would be the dose in rem ?
D:How much energy would a 180 g portion of fish absorb in J?
Explanation / Answer
a) since in the question it is not given for what dose of x-ray we have to calculate dose of electron, so i'm assuming it. let a dose of 175 Krad spoilage microorganism in fish.
dose = 175 K rad ( 1 rad = 1/100 Gy)
= 175*103 rad
= 175*103*(1/100) Gy = 1750 Gy
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b) value of dose in Sv
dose = (1.50) ( 1750 Gy)
= 2.625*103 Gy
= 2.625*103 Gy ( 1 Sv/ 1 Gy)
= 2.625*103 Sv
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c) dose in rem:
( 1 Sv = 100 rem)
dose = 2.625*103 *100 rem
= 2.625*105 rem
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d) energy(E) of 180g portion of fish absorbed is:
E = (dose) (180 g)
E = 175*103 rad* 180*10-3 kg ( 1 rad = 0.01 J/ Kg)
E = 175*103*(0.01 J/ Kg)*180*10-3 kg
E = 315 J