Semiconductors for Radiation Measurements

Flashcards covering the mechanisms, applications, and measurement units of semiconductor radiation detectors as described in the lecture.

What are some common applications for handheld semiconductor detectors?

Environmental surveys conducted by nuclear medicine technologists and medical physicists.

In what way do medical physicists use semiconductor detectors for x-ray testing?

They use them to ensure the x-ray tube is functioning correctly.

What specific imaging components are constructed with semiconductor detectors?

Automatic exposure control (AEC) cells and direct capture digital image receptors.

What is the primary function of the semiconductor crystal?

When photons strike the material, it immediately creates electrons.

Why is the semiconductor crystal sometimes referred to as a photoconductor?

Because it conducts electricity in response to photons.

What is a key structural difference between a semiconductor detector and a scintillation detector?

A semiconductor detector has no photocathode because electrons are created directly within the crystal.

What device is used to increase the weak electrical signal generated by a semiconductor?

An amplifier or multiplier.

Which units of measurement are typically used when semiconductors measure radioactivity?

Becquerel, counts per minute, or counts per second.

What specific units are used when semiconductor detectors evaluate photon energy?

$KeV$ or $MeV$.

What is the definition of gamma or photon spectroscopy?

The process through which specific energy levels within a photon beam are measured.

In an x-ray beam spectrum, what do the large hump and the peak represent?

The large hump represents Bremsstrahlung radiation and the peak represents characteristic radiation.

How do semiconductor detectors differ from scintillation detectors in terms of energy conversion?

Semiconductors directly convert X-ray photons into an electrical signal and do not produce visible light.