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Chapter 24: Q24.66 P (page 1104)

What two ways are radioactive tracers used in organisms?

Short Answer

Expert verified

Tracing chemical pathways and material flow with radioactive tracers is possible.

Step by step solution

01

Radioactive tracers

Radioactive tracers are the artificial compounds that are mainly used in medicine field for imaging purpose. Radio isotopes are inserted in these molecules.

02

Explanation

* Radioactive tracers can be used to trace reaction pathways: radioisotopes emit radiation that signify the presence of various substances which may be observed in specific reaction pathways (when more than one can be taken).

* They can also be used to study flow of materials. Large bodies of water can be observed by using tracers to see their volume and flow rate.

Hence Radioactive tracers can be used to trace reaction pathways, and flow of materials.

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Most popular questions from this chapter

The rd-century starship Enterprise uses a substance called 鈥渄ilithium crystals鈥� as its fuel.

(a) Assuming this material is the result of fusion, what is the product of the fusion of two ${}^{6}L i$ nuclei ?

(b) How much energy is released per kilogram of dilithium formed? (Mass of one ${}^{6}L i$ atom is 6.01512 amu.)

(c) When four ${}^{1}H$ atoms fuse to form ${}^{4}H e$ , how many positrons are released?

(d) To determine the energy potential of the fusion processes in parts (b) and (c), compare the changes in mass per kilogram of dilithium and of .

(e) Compare the change in mass per kilogram in part (b) to that for the formation of ${}^{4}H e$ by the method used in current fusion reactors

(f) Using early st-century fusion technology, how much tritium can be produced per kilogram of ${}^{6}L i$ in the following reaction: ${}_{3}^{6}L i +_{0}^{1} n {鈫�}_{2}^{4} H e +_{1}^{3} H$ ? When this amount of tritium is fused with deuterium, what is the change in mass? How does this quantity compare with the use of dilithium in part (b)?

Question:In a natural decay series, how many $伪$ and $尾^{-}$ emissions per atom of uranium-235 result in an atom of lead-207?

Question:After 1 minute, three radioactive nuclei remain from an original sample of six. Is it valid to conclude that $t_{1 / 2}$ equals 1 minute? Is this conclusion valid if the original sample contained $6 脳 10^{12}$ nuclei and $3 脳 10^{12}$ remain after 1 minute? Explain.

${}^{90}K r (t_{1 / 2} = 32 s)$ is used to study respiration. How soon after being made must a sample be administered to the patient if the activity must be at least 90% of the original activity?

A steel part is treated to form some iron-59 . Oil used to lubricate the part emits298 particles (with the energy characteristic of $^{59} Fe$ ) per minute per milliliter of oil. What other information would you need to calculate the rate of removal of the steel from the part during use?

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