Physics, 05.07.2019 00:10, jamaiciaw6
Radioactive isotopes are often introduced into the body through the bloodstream. their spread through the body can then be monitored by detecting the appearance of radiation in different organs. 1311, a b- emitter with a half-life of 8.0 days is one such tracer. suppose a scientist introduces a sample with an activity of 375 bq and watches it spread to the organs. assuming that the sample all went to the thyroid gland, what will be the decay rate (activity) in that gland 24 days later? if the subject's thyroid has a mass of 20 grams, and each b- is of energy 5 kev, what is the total dose of radiation the thyroid receives?
Answers: 2
Physics, 23.06.2019 00:00, elyssa34972
Examine the drawing of a molecule. each ring represents an atom of nitrogen (n). whatβs the chemical formula of this substance?
Answers: 2
Physics, 23.06.2019 11:00, valles36
1) a child holds two dogs on two separate leads. the dogs are pulling in different directions. one is pulling a force of 20n north and one is pulling 15n eastwards. calculate the resultant force on the child. state the direction. (use the parallelogram of forces) 2) a force of 20n acts horizontally on an object. a second force of 5n acts at 60 degrees to the first one. calculate the resultant force. worth 20 points, need answers asap with method you x
Answers: 2
Radioactive isotopes are often introduced into the body through the bloodstream. their spread throug...
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