IRRSP CERTIFICATION EVALUATION 2026
QUESTIONS AND SOLUTIONS VERIFIED
ANSWERS GRADED A+
●● Specific emission Constant for Ir192 is?.
Answer: 5.2 R/Hr/ci @ 1ft
●● What is the Half Life for Ir192?.
Answer: 74 days
●● What is the Half life for co60 ?.
Answer: 5.3 years
●● In the beginning of Radiography, Wilhelm Conrad Rontgen scientist
won the Nobel prize and how did he get to do this ?.
Answer:
●● in 1896 while investigating phosphorescence in uranium salts, he
accidentally discovered radioactivity . as he was investigating the work
of Mr rontgen , Becquerel wrapped a fluorescent substance , potassium.
Answer: Henri Becquerel 1852-1908
,●● gamma radiography got its start in the united states in 1929 at a
naval research laboratory. the navy wanted a method to inspect think
steel casting , but x ray available at the time were limited to 3 in"
using radium it was possible to inspaect thhinknesse in the range of 10"
in to12" in these radiographs were achieved by a method called
fishpoling.
Answer: Early Gamma Radiography
●● fishpoling required a radiographer to hold a weak radium source to a
long rod for the time length of the exposure, or to prop the fishpole
through a rig to hold it steady..
Answer: Fishpoling
●● manufactured gamma-ray sources and cobalt become available in
what year ?.
Answer: 1946 .
●● Ernest Rutherford.
Answer: Alpha particles were discovered by
?
●● poor equipment design,
lack of understanding,
lack of poor safety practices..
, Answer: in the early years of radiography, what caused personnel to be
overexposed?
●● late in 1898..
Answer: in what year did Marie Curie discover radium?
●● Marie and Pierre Curie.
Answer: Who coined the term radioactivity?
●● 3" in. (7.62 cm).
Answer: In the early years of radiography from 1920-1930, the
maximum thickness that could be inspected via X-radiation
was__________ of steel?
●● -improper surveys
-the source being left in an uncontrolled state
-the source not being locked once retracted to the shielded position.
Answer: Historically, it has been proven that the predominant cause of
overexposures is?
●● the responsibility to adhere to the regulations, license conditions and
company policies falls to.
Answer: the radiographer
QUESTIONS AND SOLUTIONS VERIFIED
ANSWERS GRADED A+
●● Specific emission Constant for Ir192 is?.
Answer: 5.2 R/Hr/ci @ 1ft
●● What is the Half Life for Ir192?.
Answer: 74 days
●● What is the Half life for co60 ?.
Answer: 5.3 years
●● In the beginning of Radiography, Wilhelm Conrad Rontgen scientist
won the Nobel prize and how did he get to do this ?.
Answer:
●● in 1896 while investigating phosphorescence in uranium salts, he
accidentally discovered radioactivity . as he was investigating the work
of Mr rontgen , Becquerel wrapped a fluorescent substance , potassium.
Answer: Henri Becquerel 1852-1908
,●● gamma radiography got its start in the united states in 1929 at a
naval research laboratory. the navy wanted a method to inspect think
steel casting , but x ray available at the time were limited to 3 in"
using radium it was possible to inspaect thhinknesse in the range of 10"
in to12" in these radiographs were achieved by a method called
fishpoling.
Answer: Early Gamma Radiography
●● fishpoling required a radiographer to hold a weak radium source to a
long rod for the time length of the exposure, or to prop the fishpole
through a rig to hold it steady..
Answer: Fishpoling
●● manufactured gamma-ray sources and cobalt become available in
what year ?.
Answer: 1946 .
●● Ernest Rutherford.
Answer: Alpha particles were discovered by
?
●● poor equipment design,
lack of understanding,
lack of poor safety practices..
, Answer: in the early years of radiography, what caused personnel to be
overexposed?
●● late in 1898..
Answer: in what year did Marie Curie discover radium?
●● Marie and Pierre Curie.
Answer: Who coined the term radioactivity?
●● 3" in. (7.62 cm).
Answer: In the early years of radiography from 1920-1930, the
maximum thickness that could be inspected via X-radiation
was__________ of steel?
●● -improper surveys
-the source being left in an uncontrolled state
-the source not being locked once retracted to the shielded position.
Answer: Historically, it has been proven that the predominant cause of
overexposures is?
●● the responsibility to adhere to the regulations, license conditions and
company policies falls to.
Answer: the radiographer
