To give blood you must: 1  Be in general good health.  Be at least 17 years old. (If you are 16 you can donate with a CBC consent form signed by your parent). There is no upper age limit as long as you have no health restrictions.
Specific radiative intensity. Specific (radiative) intensity is a quantity used in physics that describes electromagnetic radiation. It is a term used in much of the older scientific literature. The present-day SI term is spectral radiance, which can be expressed in base SI units as W mâ2 srâ1 Hzâ1.
Part of the IT standards and organizations glossary: Luminous intensity is an expression of the amount of light power emanating from a point source within a solid angle of one steradian. For reference, a frequency of 540 terahertz (540 THz or 5.40 x 10 14 Hz) is specified. The quantities used to express luminous intensity are arcane to most non-scientists.