- on Test & Measurement
- Published in issue 6/2011 on page 22
Measure Gamma Rays with a Photodiode
Radiation detector using a BPW34
The first device that springs to mind when thinking about measuring radioactivity is the Geiger-Müller tube. However, these counter tubes are getting hard to find and expensive, and even if you do manage to get hold of one, you will still need to find a way to generate its operating voltage of several hundred volts. It is less well known that even a humble photodiode such as the BPW34 can be used to detect X-rays and gamma radiation.