1. The SI unit of radiation dose is \"gray\" (Gy) which is radiation equivalent
ID: 1770197 • Letter: 1
Question
1. The SI unit of radiation dose is "gray" (Gy) which is radiation equivalent to 1 J/kg. A small energy delivered as ionizing radiation can create huge damage at the cellular level, and the sievert is a unit of the health effect of radiation proportional to the radiation dose, but multiplied by factors allowing for the absorption and and the nature of the radiation.
Which of these statements are true? You may need to research these answers, but they are useful to know.
The natural background radiation is about 1 milli-sievert a year
NASA astronauts are allowed to receive a dose of 1 sievert during their career
The background 50 km from the site after a nuclear weapons detonation is 1 sievert.
A dose of 4 to 5 sieverts will kill a human with a 50% probability within 30 days if the dose is received over a short period (say accidental exposure).
The background radiation flying in a commercial aircraft is 10x the natural background at the surface of Earth.
The dosage from a dental X-ray is 1 milli-sievert.
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2. Match the element with its spectrum
A series of visible lines starting in the red, then blue, then deeper blue, and disappearing into the ultraviolet.
Causes the yellow when salt is dropped into a flame.
An intense yellow line when the gas is excited, first discovered in the Sun rather than on Earth.
Causes the blue-green flash when lightening strikes a power line
Copper
Helium
Sodium
Hydrogen
The natural background radiation is about 1 milli-sievert a year
NASA astronauts are allowed to receive a dose of 1 sievert during their career
The background 50 km from the site after a nuclear weapons detonation is 1 sievert.
A dose of 4 to 5 sieverts will kill a human with a 50% probability within 30 days if the dose is received over a short period (say accidental exposure).
The background radiation flying in a commercial aircraft is 10x the natural background at the surface of Earth.
The dosage from a dental X-ray is 1 milli-sievert.
Explanation / Answer
1. The answer is 2nd and 4th option as
A) NASA astronauts are allowed to receive a dose of 1 sievert during their career.
B) A dose of 4 to 5 sieverts will kill a human with a 50% probability within 30 days if the dose is received over a very short duration. It is called "Lethal Dose".
2 ) A - Hydrogen
B - Sodium
C - Helium
D - Copper
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