The most important task of an air monitoring system is to give an alarm signal in the shortest time possible, when the radioactivity in the monitored area exceeds the natural level. Resulting from nuclear accidents or explosions, artificial radionuclides of various elements can be released into the atmosphere. The most mobile ones are the noble gases (Xe, Kr) and volatile elements (I, Cs and some others). Warning levels can be established on either the measurement of external dose rate, primarily due to gamma-radiation from a radioactive plume ("skyshine radiation") or from contaminated ground surface or on the measurement of radiocontamination adhered to floating.....

aerosol particulates. In special cases, the first warning signal may also be based on monitoring radioactivity of surface waters.

As aerosol filters coupled to air pumps are capable of accumulating particles from large volumes of air onto a small surface, their radioactive content can be determined with good measuring efficiency thus allowing advantageously low detection and warning levels. The ASU contains two consecutive static filters, the first one is for aerosol particles and the second filter is for molecular iodine.

The primary function of the ASU is sampling air through filters and measuring the activity of the retained aerosols. The unit sends Warning and Alarm messages, when the activity exceeds predefined levels.

As aerosol filters coupled to air pumps are capable of accumulating particles from large volumes of air onto a small surface, their radioactive content can be determined with good measuring efficiency thus allowing advantageously low detection and warning levels. The ASU-HV120-O contains two consecutive static filters, the first one is for aerosol particles and the second filter is for molecular iodine.

The primary function of the ASU-HV120-O is sampling air through filters and measuring the activity of the retained aerosols. The unit sends Warning and Alarm messages, when the activity exceeds predefined levels.

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