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OHIO LEAD RISK ASSESSOR FINAL EXAM VERSION 2 LATEST 2026-2027
ACTUAL EXAM WITH COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (100% VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
List the six substrates HUD recommends we use - ANSWER-
Wood, drywall, plaster, metal, brick, concrete
How many walls do we test in each room? - ANSWER-All 4 walls
When would we test more than one door in the same room
equivalent? - ANSWER-When the doors are differently
painted/glazed
What type of XRF is currently used in our industry? - ANSWER-
Spectrum analyzer
What are the two radioactive sources used in XRFs and what is
the half-life of each? - ANSWER-Cobalt-57 isotope (9 months)
and cadmium-109 (15 months)
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What is a dosimeter? - ANSWER-a device used to measure an
absorbed dose of ionizing radiation.
How often do we check the calibration of an XRF? - ANSWER-
Before inspection, every 4 hours during the inspection, after
inspection
How do we check the calibration of an XRF? - ANSWER-Test it on
a surface with a known level of lead 3 times and average it then
test on a surface with no lead 3 times and average it
Define accuracy - ANSWER-measurement close to true value
Define Bias - ANSWER-A systematic error in reading
Define precision - ANSWER-how close measurements are to
each other
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What are the storage requirements of an XRF? - ANSWER-It has
to have the radiation sign on its storage area and has to be in a
case in a secure area
How many we not ship an XRF? - ANSWER-Through USPS
Why does spatial variation in the amount of lead that is in a
painted surface complicate the sampling of paint for lead? -
ANSWER-You wouldn't always know the true concentration of
lead in the paint
Why is it important that we select a test location that has all layers
of paint? - ANSWER-Because it should be representative of areas
most likely to be coated w/ old paint or other lead-based coatings
Why is it important that we test on layers of paint? - ANSWER-So
that you can get a more accurate measurement of the lead in all
the layers
OHIO LEAD RISK ASSESSOR FINAL EXAM VERSION 2 LATEST 2026-2027
ACTUAL EXAM WITH COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (100% VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
List the six substrates HUD recommends we use - ANSWER-
Wood, drywall, plaster, metal, brick, concrete
How many walls do we test in each room? - ANSWER-All 4 walls
When would we test more than one door in the same room
equivalent? - ANSWER-When the doors are differently
painted/glazed
What type of XRF is currently used in our industry? - ANSWER-
Spectrum analyzer
What are the two radioactive sources used in XRFs and what is
the half-life of each? - ANSWER-Cobalt-57 isotope (9 months)
and cadmium-109 (15 months)
,2|Page
What is a dosimeter? - ANSWER-a device used to measure an
absorbed dose of ionizing radiation.
How often do we check the calibration of an XRF? - ANSWER-
Before inspection, every 4 hours during the inspection, after
inspection
How do we check the calibration of an XRF? - ANSWER-Test it on
a surface with a known level of lead 3 times and average it then
test on a surface with no lead 3 times and average it
Define accuracy - ANSWER-measurement close to true value
Define Bias - ANSWER-A systematic error in reading
Define precision - ANSWER-how close measurements are to
each other
, 3|Page
What are the storage requirements of an XRF? - ANSWER-It has
to have the radiation sign on its storage area and has to be in a
case in a secure area
How many we not ship an XRF? - ANSWER-Through USPS
Why does spatial variation in the amount of lead that is in a
painted surface complicate the sampling of paint for lead? -
ANSWER-You wouldn't always know the true concentration of
lead in the paint
Why is it important that we select a test location that has all layers
of paint? - ANSWER-Because it should be representative of areas
most likely to be coated w/ old paint or other lead-based coatings
Why is it important that we test on layers of paint? - ANSWER-So
that you can get a more accurate measurement of the lead in all
the layers
