Maximum Atmospheric Concentration or Maximum Allowance
is the concentration of a toxicant in air (or
water) below which deleterious effects are insignificant for eight hours a
day, five days a week over a working lifetime.
Maximum Permissible Level (MPL):
is the limit of radiation or
isotope exposure below which one is unlikely to see serious deleterious
effect over a lifetime exposure.
Median Lethal Dose (LD50):
is the dose of a toxicant at which 50% of
the population of same specie dies within a specified time and under the
specified conditions of the experiment.
Median Toxic Dose (TD50):
is the dose of a toxicant which causes
50% toxic response point in a specified population and conditions.
is the study of the interaction between
drugs and the environment in terms of benefit and risk or it is the study
of the effects of drugs on the environment in order to safeguard our
environment. The study allows a comprehensive risk assessment of
pharmaceuticals on our environment.
Poisons or toxicants:
are drugs that produce harmful effects when
given at a certain dose or circumstance.
this is a substance that occurs in the environment, at least in
part as a result of human activity, and which has a deleterious effect on
is the expected frequency of the occurrence of an undesirable
effect arising from exposure to a chemical or physical agent.
Route of exposure
is the route of entry for chemicals into the body.
this is a personnel that instigates or enforces a code of
practice in the conduct of safety for the work place.
Sub acute toxicity:
this is lesser intense than acute effect and is
produced after repeated exposure over a short period of time (within 1
Sub chronic toxicity:
this is produced after repeated exposure over a
period of 1 -3 months.