
Concept explainers
A 50-µC/kg (approximately 200 mR) pocket dosimeter with air-equivalent walls has a sensitive volume with the dimensions in. (diameter) and 2.5 in. (length); the volume is filled with air at atmospheric pressure. The capacitance of the dosimeter is 10 pF. If 200 V are required to charge the chamber, what is the voltage across the chamber when it reads

The voltage across the chamber when it reads 50 µC/kg
Answer to Problem 6.1P
The voltage across the chamber when it reads 50 µC/kg is 150.755 V
Explanation of Solution
Given info:
Diameter, D = 0.5 in
Length, L = 2.5 in
Capacitance, C = 10 pF
Initial Voltage,
Formula used:
To calculate volume of the chamber, use the formula as
Calculation:
First convert the unit from ‘in’ to ‘cm’.
We know, 1 in = 2.54 cm
So, L = 2.5 in = 2.5 × 2.54 cm = 6.35 cm
Also, D = 0.5 in,
Substitute the values in equation (1), we get
Also given that,
Or,
To calculate mass (m), use the relation
Or,
Since, volume is filled with air,
Substitute the values in equation (2), we get
Now, to calculate final voltage use the relation
Substitute the values, we get
Conclusion:
Thus, the voltage across the chamber when it reads 50µC/kg is 150.755V
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