Accurate radiation dosimetry is required for different applications and is essential in radiation therapy of cancer patients. It is also needed in many other areas, such as the op ...

THE first international radium standard was prepared ... of this gas are impracticable as units, and it was therefore decided to use as unit of radon the quantity which is in radioactive ...

Metric measurements — also known as the International System of Units, or SI — are managed by a formal international organization. The rulers of the rulers have rules, and "hellabyte" and ...

A nanometer (nm) is a unit of length in the metric system, defined as one billionth (10-9) of a meter (m). The meter is the base unit of length in the International System of Units (SI), making the ...

A nanosecond (ns) is a unit of time in the metric system, equal to one billionth (10-9) of a second (s). The second is the base unit of time in the International System of Units (SI), making the ...