Help Me Decipher: Radio-nuclide in Blood Volume

In summary, the conversation discusses a scenario where a man is injected with a small amount of solution containing Na24 radio-nuclide. After 5 hours, a blood sample is taken and the activity is measured to be 16 disintegrations per minute per cc. With the half-life of the radio nuclide being 15 hours, the total volume of the man's blood can be calculated by back decaying the final concentration.
  • #1
Reshma
749
6
Someone first of all someone help me decipher this question.

A small amount of solution containing Na24 radio-nuclide with activity A0 = 2 x 103 disintegrations per second was injected in the bloodstream of a man. The activity of 1.0cc of blood sample, taken 5 hours later, turned out to be A = 16 disintegrations per minute per cc. The half-life of the radio nuclide is T = 15hrs. Find the total volume of the man's blood.
 
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  • #2
If you set the volume of blood to be V, then the inital concentration is A_0 over V, and the final concentration is given. You should be able to find V by back decaying the final concentration.

Does that help?
 

Related to Help Me Decipher: Radio-nuclide in Blood Volume

1. What is a radio-nuclide?

A radio-nuclide is an unstable form of an element that emits radiation as it decays into a more stable form. It is also known as a radioactive isotope.

2. How is a radio-nuclide detected in blood volume?

A radio-nuclide can be detected in blood volume through a process called scintigraphy, where a small amount of a radioactive substance is injected into the bloodstream and a special camera is used to capture images of the distribution of the substance in the body.

3. What is the purpose of measuring radio-nuclide in blood volume?

Measuring radio-nuclide in blood volume is a way to assess the function and health of various organs in the body, as well as to detect any abnormalities or diseases.

4. What are the potential risks associated with measuring radio-nuclide in blood volume?

The risks associated with measuring radio-nuclide in blood volume are minimal, as the amount of radioactive substance used is very small and quickly eliminated by the body. However, there is a small risk of allergic reactions or infection at the injection site.

5. How are the results of radio-nuclide measurements interpreted?

The results of radio-nuclide measurements are interpreted by comparing them to normal values and patterns, as well as other diagnostic tests. A specialist, such as a nuclear medicine physician, will analyze the images and provide a report to the referring doctor for further evaluation and treatment if needed.

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