What is the usual range of voltage used in X-ray tubes?

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The typical range of voltage used in X-ray tubes is between 70 to 120 kilovolts (kV). This voltage range is optimal for generating X-rays because it provides sufficient energy to enable the electrons accelerated by the voltage to produce X-rays upon striking the target material. The energy of the X-rays produced is crucial for achieving the desired penetration and image quality when conducting radiographic procedures.

Within this range, the voltage affects the quality (penetrating power) and quantity (intensity) of the X-rays generated. Lower voltages may result in insufficient energy for penetrating denser tissues, while higher voltages can lead to stronger images but might also increase the radiation dose to the patient.

The other ranges provided do not align with the standard operating conditions for most diagnostic X-ray equipment used in medical imaging. Options that suggest lower voltages, like 10-30 kV or 20-60 kV, are typically associated with specific applications or types of imaging (like dental X-rays), while the higher voltage range of 130-200 kV is usually reserved for specialized procedures, such as certain therapeutic or industrial applications, rather than standard diagnostic radiography.