“Target material” which produces X-rays in a diagnostic X-rays tube is made of:
**Core Concept**
The production of X-rays in a diagnostic X-ray tube involves the acceleration of electrons, which then collide with a target material, resulting in the emission of X-rays due to **bremsstrahlung radiation** and **characteristic radiation**. This process is fundamental to the operation of X-ray tubes. The target material is crucial for the efficiency and safety of the X-ray production.
**Why the Correct Answer is Right**
The correct target material is **Tungsten (W)**, which is commonly used due to its high melting point, high atomic number, and high density. Tungsten's high atomic number (**Z=74**) is particularly advantageous for producing X-rays through **bremsstrahlung** and **characteristic X-ray emission** when bombarded with high-energy electrons.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because, while other materials can be used for specific applications, they are not the standard or preferred material for diagnostic X-ray tubes.
**Option B:** Incorrect as it does not specify the correct material used in diagnostic X-ray tubes.
**Option C:** Incorrect because, although tungsten is the correct answer, this option does not provide it.
**Option D:** Incorrect for the same reason as options A, B, and C, as it does not correctly identify tungsten.
**Clinical Pearl / High-Yield Fact**
Remember, **tungsten** is used because of its unique properties that allow for efficient X-ray production. This is a critical point for understanding the basics of diagnostic radiology.
**Correct Answer:** D. Tungsten.