What is the annual dose-equivalent limit for the skin and hands of an occupationally exposed individual?

Application        Dose limits

Effective dose (whole body), Hp (10)    50 mSv per year (or 1mSv per week)

20 mSv per year (or 0.4 mSv per week) averaged over  

defined periods of five years

Annual equivalent dose to lens of the eye, Hp (3)  150 mSv

Annual equivalent dose to the skin, Hp (0.07)  500 mSv

Annual equivalent dose to hands and feet  500 mSv

Explanation:

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.