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.
+ Intensity level for an average person, defined here as 70 kg or 154 lbs. The activity intensity levels portrayed in this cha rt are most applicable. to men aged 30 to 50 years and women aged 20 to 40 years. Intens ity is a subjective classification. For example, what is vigorous intensity for a. moderately fit individual might be moderate intensity for a highly fit individual.