N3 Laser Safety Exam Questions and
Answers
Ionisation - Correct Answers -Electrical process in which electron is knocked out of its
orbit
Ionising radiation - Correct Answers -radiation that is energetic and capable of causing
atoms and molecules in its path to split into positive and negative ions
ionising radiation includes - Correct Answers -alpha, beta and gamma rays
decay of radioactive substances produces what rays - Correct Answers -alpha, beta and
gamma rays
x-ray machines produce - Correct Answers -x-rays
particulate radiation consist of ___ and ___ rays - Correct Answers -alpha, beta
x-rays are electromagnetic radiation of wavelength - Correct Answers -100nm to 1e-5
nm
RPNIRR: Ultraviolet sunlamps are - Correct Answers -lamps or apparatus incorporating
one or more ultraviolet lamps for irradiation of any part of living human body, by
ultraviolet radiation wavelength 180nm<lambda<400nm to induce skin tanning
RPNIRR: Microwave ovens are - Correct Answers -devices designed to heat, cook or
dry food through microwave energy frequency from 890 MHz to 6 GHz
RPNIRR: Medical and industrial ultrasound apparatus are designed to generate and
emit - Correct Answers -ultrasonic power at acoustic frequencies above 16 kHz
RPNIRR: Magnetic resonance imaging apparatus are - Correct Answers -designed to
emit magnetic field and radio-frequency radiation for purpose of imaging or
spectroscopy of human body or both
RPNIRR: Entertainment lasers are - Correct Answers -any laser designed for used in
laser light shows
RPNIRR: High power lasers are class... - Correct Answers -any laser from Class 3b and
Class 4.
, RPNIRR: License to use class 4 medical lasers granted to registered ______ and ____
only - Correct Answers -medical practitioners and dentists
alpha, beta, gamma rays result from - Correct Answers -spontaneous re-arrangements
within unstable nuclei
x-rays produced by - Correct Answers -electroncs jumping between orbits close to
nucleus or electrons losing energy when passing through strong electric field close to
nucleus
x-rays are unlike radiation from radioactive sources because - Correct Answers -they
can be "turned off" by disconnecting high voltage
alpha and beta are - Correct Answers -sub-atomic particles
gamma and x-ray are - Correct Answers -electromagnetic rays
alpha radiation completely absorbed by - Correct Answers -sheet of paper, few
centimeters of air
beta radiation completely absorbed by - Correct Answers -few cm of wood, glass, water
or several meters of air
gamma and x-ray intensity reduced significantly by - Correct Answers -few mm of lead,
few cm of concrete/brick (low energy). 10cm or more of lead, meter or so of
concrete/brick (high energy)
non-ionising radiation refers to radiation which - Correct Answers -energy not capable in
causing ionistion, but capable in causing other injuries
non-ionising radiation wavelengths - Correct Answers -greater than 100nm and acoustic
radiation and fields with frequencies above 16 kHz
examples of non-ionising radiation - Correct Answers -microwave, ultraviolet, visible,
infrared, laser, ultrasound radiation
electromagnetic radiation created by - Correct Answers -oscillating electric charges
kind of EM radiation emitted is determined by - Correct Answers -frequency of
oscillation
EM radiation can be considered as a stream of particles called - Correct Answers -
photons
photon has associated an amount of energy - Correct Answers -hf, h is Planck's
constant, f is frequency
Answers
Ionisation - Correct Answers -Electrical process in which electron is knocked out of its
orbit
Ionising radiation - Correct Answers -radiation that is energetic and capable of causing
atoms and molecules in its path to split into positive and negative ions
ionising radiation includes - Correct Answers -alpha, beta and gamma rays
decay of radioactive substances produces what rays - Correct Answers -alpha, beta and
gamma rays
x-ray machines produce - Correct Answers -x-rays
particulate radiation consist of ___ and ___ rays - Correct Answers -alpha, beta
x-rays are electromagnetic radiation of wavelength - Correct Answers -100nm to 1e-5
nm
RPNIRR: Ultraviolet sunlamps are - Correct Answers -lamps or apparatus incorporating
one or more ultraviolet lamps for irradiation of any part of living human body, by
ultraviolet radiation wavelength 180nm<lambda<400nm to induce skin tanning
RPNIRR: Microwave ovens are - Correct Answers -devices designed to heat, cook or
dry food through microwave energy frequency from 890 MHz to 6 GHz
RPNIRR: Medical and industrial ultrasound apparatus are designed to generate and
emit - Correct Answers -ultrasonic power at acoustic frequencies above 16 kHz
RPNIRR: Magnetic resonance imaging apparatus are - Correct Answers -designed to
emit magnetic field and radio-frequency radiation for purpose of imaging or
spectroscopy of human body or both
RPNIRR: Entertainment lasers are - Correct Answers -any laser designed for used in
laser light shows
RPNIRR: High power lasers are class... - Correct Answers -any laser from Class 3b and
Class 4.
, RPNIRR: License to use class 4 medical lasers granted to registered ______ and ____
only - Correct Answers -medical practitioners and dentists
alpha, beta, gamma rays result from - Correct Answers -spontaneous re-arrangements
within unstable nuclei
x-rays produced by - Correct Answers -electroncs jumping between orbits close to
nucleus or electrons losing energy when passing through strong electric field close to
nucleus
x-rays are unlike radiation from radioactive sources because - Correct Answers -they
can be "turned off" by disconnecting high voltage
alpha and beta are - Correct Answers -sub-atomic particles
gamma and x-ray are - Correct Answers -electromagnetic rays
alpha radiation completely absorbed by - Correct Answers -sheet of paper, few
centimeters of air
beta radiation completely absorbed by - Correct Answers -few cm of wood, glass, water
or several meters of air
gamma and x-ray intensity reduced significantly by - Correct Answers -few mm of lead,
few cm of concrete/brick (low energy). 10cm or more of lead, meter or so of
concrete/brick (high energy)
non-ionising radiation refers to radiation which - Correct Answers -energy not capable in
causing ionistion, but capable in causing other injuries
non-ionising radiation wavelengths - Correct Answers -greater than 100nm and acoustic
radiation and fields with frequencies above 16 kHz
examples of non-ionising radiation - Correct Answers -microwave, ultraviolet, visible,
infrared, laser, ultrasound radiation
electromagnetic radiation created by - Correct Answers -oscillating electric charges
kind of EM radiation emitted is determined by - Correct Answers -frequency of
oscillation
EM radiation can be considered as a stream of particles called - Correct Answers -
photons
photon has associated an amount of energy - Correct Answers -hf, h is Planck's
constant, f is frequency
