count per minute การใช้

• Such measurements are typically counts per unit time received by the detector, such as counts per minute or counts per second.
• "' Counts per minute ( abbreviated to cpm ) "'is a measure of the detection rate of ionization events per minute.
• The concentration instantly steps up to its constant value when the time reaches 30 minutes, and there is a 100 count per minute ( cpm ) constant background.
• Once the isotope is identified, the counts must be converted to DPM . This calculation requires knowing the conversion efficiency of the NaI ( tl ) from CPM ( counts per minute ) to DPM.
• Since the mass of the sample is known, this can be converted to a standard measure of activity in units of either counts per minute per gram of carbon ( cpm / g C ), or becquerels per kg ( Bq / kg C, in SI units ).
• The measurement of ionizing radiation is sometimes expressed as being a " rate " of counts per unit time as registered by a radiation monitoring instrument, for which "'counts per minute "'( cpm ) and "'counts per second "'( cps ) are commonly used quantities.