The right answer is 28 years.
The half-life, or period of a radioactive isotope, is the time required for half of the nuclei of this isotope initially present to decay naturally.
One gram of pure 90 strontium has a radioactivity of 5.11 TBq. Its beta radiation is not penetrating, which makes it difficult to measure when it is in the soil or a matrix. It is very harmful when the particle is inhaled or ingested.
Answer:
A
Explanation:
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Answer:
Gardening can show you all kinds of plants, and how to take care of them. Gardening can also show you the outside world and why plants are needed.
Answer;
Zone II
The area most significantly subjected to the ecological principles suggested by park is Zone II.
Explanation;
Zone II also the zone in transition, is appropriately named since it was truly in a state of transition from residential to industrial, primarily because it was the area of the city in which businesses and factories were invading residential areas. was the area that was most significantly subjected to the ecological principles, Park suggested: invasion, domination, recession, and succession.