Beside this, are ionization smoke detectors banned?
1. Are ionization smoke detectors banned? Ionization smoke detectors are banned in some countries, this is because of the radioactive material Americium 241. It’s, however, not harmful to human beings because the isotopes are released in minimal amounts.
Herein, do I need both ionization and photoelectric smoke detectors?
Because no one can know when a fire will occur or what type of fire they will have in their home, virtually every recognized fire authority and safety expert – including NFPA, the U.S. Fire Administration (USFA), Consumer Product Safety Commission (CPSC) and Underwriters Laboratories (UL) – recommend having both …
How much radiation is in a smoke detector?
Smoke detectors are very safe
Most units sold today use one microcurie or less of americium-241. A 2001 NRC study found people with two of these units in their homes receive less than 0.002 millirems of radiation dose each year.
The radiation dose to the occupants of a house from these smoke alarms is very small and does not pose a health risk. Due to the small amount of material used and the secure means of its encapsulation, these smoke alarms are completely safe under all normal conditions it may encounter, including during a fire.
The main argument behind the recommendation is that since ionization alarms typically respond faster to fast-fires and photoelectric alarms respond faster to smoldering fires, the presence of both types will be most effective in protecting a home.
There are three types of smoke alarms, ionization, photoelectric and a combination of the two which is commonly called a “dual” detector.
An ionization smoke detector is a fire alarm system with a built-in ionization chamber supported by two plates with voltage between them. Electrons present between the two plates are displaced by smoke entering the chamber, which in turn causes an alarm to go off.
They travel the United States educating the public and promoting laws which prohibit the use of ionization smoke alarms unless supplemented by photoelectric alarms. Three states (Iowa, Massachusetts and Vermont) and several communities have banned ionization smoke alarms as standalone smoke detectors.
Ionization smoke alarms tend to respond faster to the smoke produced by flaming fires than photoelectric smoke alarms. Photoelectric smoke alarms tend to respond faster to the smoke produced by smoldering fires than ionization smoke alarms.