Problem:
A radiograph is made at 74kVp/100mAs. How many electrons interact with the target?

To determine how many electrons interact with the target in an X-ray tube during the exposure, we need to understand the relationship between the charge (current) and the number of electrons involved.

Given:
- The current-time product is 100 mAs (milliampere-seconds).
- 1 mAs = \( 1 \times 10^{-3} \) A·s (ampere-seconds).
- 74 kVp (kilovolt peak) refers to the potential difference, which influences the energy of the electrons, but not their number.

### Step 1: Convert mAs to Coulombs
Current in amperes (\(I\)) multiplied by time (\(t\)) gives the total charge (\(Q\)) in coulombs:
\[
Q = I \times t = 100 \, \text{mAs} = 100 \times 10^{-3} \, \text{C} = 0.1 \, \text{C}
\]

### Step 2: Determine the number of electrons
We know that each electron carries a charge of \( e = 1.6 \times 10^{-19} \, \text{C} \). Therefore, the number of electrons (\( N \)) is given by:
\[
N = \frac{Q}{e} = \frac{0.1 \, \text{C}}{1.6 \times 10^{-19} \, \text{C/electron}}
\]

### Step 3: Calculate \(N\)
\[
N = \frac{0.1}{1.6 \times 10^{-19}} = 6.25 \times 10^{17} \, \text{electrons}
\]

Thus, approximately \(6.25 \times 10^{17}\) electrons interact with the target during the radiograph exposure.

Would you like more details or have any questions?

Here are some related questions:
1. What is the role of kVp in X-ray production?
2. How does the number of electrons affect X-ray intensity?
3. What are the effects of increasing the mAs in radiography?
4. How is the energy of X-rays influenced by electron interactions?
5. What is the importance of electron charge in radiography calculations?

**Tip**: Increasing mAs increases the total number of electrons striking the target, which directly influences the X-ray beam's intensity.

A radiograph is made at 74kVp/100mAs. How many electrons interact with the target?

Find out how many electrons interact with the target in a radiograph exposure at 74kVp and 100mAs. This problem involves key physics concepts, such as the charge-current relationship and the number of electrons per coulomb. Suitable for undergraduate students in physics or radiography.

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