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.
Reference has been made in the preceding chapters to the term intensity in relation to. ultrasound, without giving it explicit scientific meaning. In this chapter, the concepts of.intensity and power of ultrasound are discussed in some detail.efinition: The intensity, I, relative to a reference intensity 10, is defined as: Relative intensity (dB) = 10 logw (1/10). The dB values will be positive if the intensity of interest, I, is larger than the reference. intensity, 10, and negative if I is less than 10.