It’s widely known that a smoke detector is a good ionizing radiation source, as they contain a small amount of americium-241, a side product of nuclear reactors. But what about other sources?

Photoelectric: These use an LED to detect smoke, which disrupts the light beam and reflects it into a sensor, activating the alarm. Ionization: These have a small amount of radioactive material ...

When smoke particles disrupt the light beam, the sensor sets off the alarm. Smoldering fires can be caused by unattended ...

Each of the four strings has a break-beam detection circuit ... If you stay tuned, you can hear [Peter] play “Smoke On the Water” after the break. There’s more than one way to make an ...

This compact alarm is just for smoke (no CO). Features include real-time alerts, automatic self-testing for battery and power ...

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Stand-alone smoke detectors include a sensor and detector circuitry. They usually contain a built-in alarm, may instead provide electrical contacts for an auxiliary alarm. Smoke detection systems are ...

Replacing smoke alarm batteries can be a hassle. It always seems that just as soon as you've installed fresh ones, the low-battery warning is beeping at you again. Many homeowners wonder why their ...

In 2003, UCLA epidemiologist James Enstrom and I published a study of environmental tobacco smoke (ETS)—also called "secondhand smoke" or "passive smoking"—in the British Medical Journal (BMJ).

While turning back the clock is important, Daylight Saving Time also serves as a reminder to check your smoke detectors. The sound of a smoke detector is not one that you want to hear, but one ...

Citizen app video shows the scene of the crash after police say a car hit a bicyclist and multiple objects in Mesa. On the final day of early voting, there were long lines at some election centers ...