The article about the Improved Radiation Meter (Elektor November 2011 contains a basic description of how the sensor — type BPW34 — has to be shielded from ambient light. Having noticed some confusion among our readers we will explain it again with the aid of some photos. The BPW34, which is suitable for the measurement of gamma radiation, can be completely enclosed; gamma radiation is strong enough to pass through various materials and still be measurable afterwards.
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