MFRI HazMat Tech Exam with Accurate Solutions
Threshold Limit Value/ Time Weighted Average - AnswerMaximum airborne
concentration maybe exposed to 8hrs a day 40hrs a week.
/.Permissible Exposure Limit - AnswerAn OSHA term for the maximum concentration
averaged over 8 hours, to which 95 percent of healthy adults can be repeatedly
exposed for 8 hours per day, 40 hours per week.
/.Short Term Exposure Limit - AnswerSTEL; legal limits established by OSHA to which
workers can be exposed continuously for a short period of time without damage or
injury; exposures at the STEL should not be for more than 15 minutes and not repeated
more than four times per work day.
/.Threshold Limit Value/ Ceiling - AnswerThis is the maximum concentration to which a
health adult can be exposed without risk of injury, and the exposure to higher
concentrations should not occur
/.Threshold Limit Value Skin - AnswerIndicates the concentration at which direct
exposure or airborne contact with a material could result in possible and significant
exposure by absorption through the skin, mucous membranes, and eyes.
/.Emergency Response Planning Guidelines ERPG-2 - AnswerThe maximum airborne
concentration which is believed all individuals could be exposed for one hour.
/.Acute Emergency Exposure Guidelines - AnswerCover five exposure periods, 10 min,
30 min, 1 hr, 4hr, 8 hrs
/.LD50 - AnswerA chemical dose lethal to 50 percent of a test population
/.Lethal Concentration - AnswerConcentration of an inhaled substance that results in the
death of a certain percentage of the test population; the lower the value the more toxic
the substance; an inhalation exposure expressed in parts per million (ppm), milligrams
per liter (mg/liter), or milligrams per cubic meter (mg/m3).
/.Curie - Answera unit of radioactivity equal to the amount of a radioactive isotope that
decays at the rate of 37,000,000,000 disintegrations per second
/.Roetgen - Answerunit used to measure nuclear radiation; it is equal to the amount of
radiation that produces 2x10^9 ion pairs when it passes through 1 cm^3 of dray air
/.rem - Answer(Roentgen Equivalent Man) the dosage of ionizing radiation that will
cause the same amount of injury to human tissue as 1 roentgen of X-rays
Threshold Limit Value/ Time Weighted Average - AnswerMaximum airborne
concentration maybe exposed to 8hrs a day 40hrs a week.
/.Permissible Exposure Limit - AnswerAn OSHA term for the maximum concentration
averaged over 8 hours, to which 95 percent of healthy adults can be repeatedly
exposed for 8 hours per day, 40 hours per week.
/.Short Term Exposure Limit - AnswerSTEL; legal limits established by OSHA to which
workers can be exposed continuously for a short period of time without damage or
injury; exposures at the STEL should not be for more than 15 minutes and not repeated
more than four times per work day.
/.Threshold Limit Value/ Ceiling - AnswerThis is the maximum concentration to which a
health adult can be exposed without risk of injury, and the exposure to higher
concentrations should not occur
/.Threshold Limit Value Skin - AnswerIndicates the concentration at which direct
exposure or airborne contact with a material could result in possible and significant
exposure by absorption through the skin, mucous membranes, and eyes.
/.Emergency Response Planning Guidelines ERPG-2 - AnswerThe maximum airborne
concentration which is believed all individuals could be exposed for one hour.
/.Acute Emergency Exposure Guidelines - AnswerCover five exposure periods, 10 min,
30 min, 1 hr, 4hr, 8 hrs
/.LD50 - AnswerA chemical dose lethal to 50 percent of a test population
/.Lethal Concentration - AnswerConcentration of an inhaled substance that results in the
death of a certain percentage of the test population; the lower the value the more toxic
the substance; an inhalation exposure expressed in parts per million (ppm), milligrams
per liter (mg/liter), or milligrams per cubic meter (mg/m3).
/.Curie - Answera unit of radioactivity equal to the amount of a radioactive isotope that
decays at the rate of 37,000,000,000 disintegrations per second
/.Roetgen - Answerunit used to measure nuclear radiation; it is equal to the amount of
radiation that produces 2x10^9 ion pairs when it passes through 1 cm^3 of dray air
/.rem - Answer(Roentgen Equivalent Man) the dosage of ionizing radiation that will
cause the same amount of injury to human tissue as 1 roentgen of X-rays
