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.
We will now define a new quantity, the spectrum level or intensity spectrum level (ISL). The intensity spectrum level (ISL) is the intensity level of the sound wave within a 1 Hz band. This is accomplished by comparing the intensity in a 1 Hz band to the reference level in a 1 Hz band.