If the exposure rate to an individual standing 7.0 feet from a source of radiation is 0.5 mgy/hr, what will be the dose received after 20 minutes at a distance of 3.0 feet from the source?

0.389mGy

Explanation:

You can simply use variation to get the answer. if at 7 feet, the exposure rate is 0.5mGy/hr. Then at 1 feet, the exposure rate would be higher because the rate at which you are exposed to radiation is inversely proportional to the distance you are from the source. i.e the smaller the distance the higher the rate of exposure.

But the question is what will be the dose exposed to after 20 minutes at a distance of 3.0 feet from the source?

we calculate as follow

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

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