Keywords for this article are RedSafe Nucleic Acid Question Answers CSWIP Course. Welding Course. TWI Course. CSWIP Course. Welding Inspection Course
RedSafe Nucleic Acid Question Answers CSWIP Course
Several isotopes of elements such as hydrogen and carbon exist in nature. The isotopes of any given element differ only in terms of:
- the number of protons in the nucleus
- the number of alpha particles in the nucleus
- the number of neutrons in the nucleus
- chemical properties
The difference between x-rays and gamma rays of equal photon energy is:
- the wavelength of the gamma rays is shorter
- x-rays originate from an x-ray tube whilst gamma rays originate from a radioactive material
- the gamma rays are more hazardous to health
- the gamma rays have a higher velocity than the x-rays
If an ytterbium 169 has a half life of 32 days and the original source activity is 5 Ci, what will the source activity be 96 days later?
- 5 Ci
- 25 Ci
- 625 Ci
- 3125 Ci
The type of radiation that has a quality factor of 20 is:
- gamma radiation
- beta particles
- alpha particles
- x-radiation
When a radiation incident occurs, such as a gamma ray source becoming jammed in the delivery tube the most sensible way to proceed is to:
- monitor the area until the HSE representative arrives
- after first of all securing the situation – if possible covering the source with bags of lead shot, adjusting safety barriers etc – make a plan of the actions that will be needed to make the source safe
- bury the equipment under several meters of earth
- call the fire brigade
One of the responsibilities of the employer of a radiographer is to:
- hold the radiographer’s dose records on file for a period of at least 2 years
- have the radiographer’s blood checked every 6 months
- each year require the radiographer to pass a written radiation test
- hold the radiographer’s dose records on file for a period of at least 75 years
Every radiation employer must appoint an RPA. The RPA is responsible for:
- performing random safety checks
- advising the employer on all matters pertaining to the ionising radiation safety regulations
- performing annual medical checks on all employees
- supervising all radiation safety incidents
The appointed doctor is responsible for:
- performing a thorough annual medical, including blood tests on all classified workers
- certifying all classified workers fit on an annual basis, this may or may not include a thorough medical examination
- checking that the classified workers can read J1 on a Jaeger chart
- both (a) and (c)
Which of the following must be logged on a daily basis?
- the whereabouts of all portable radiation sources
- the whereabouts of all radiation monitors
- the whereabouts of the RPA
- none of the above
Which isotope has a half life of 5.3 years?
- cobalt 59
- cobalt 60
- cobalt 62
- cobalt 70
Exposure to ionising radiation can have “genetic effects”. Such effects are best described as:
- those which can appear in the offspring of the person exposed to radiation
- effects such as headaches and diarrhoea which occur soon after an acute exposure to ionising radiation
- effects such as cancer which may not appear in the subject until some years after exposure to ionising radiation
- none of the above
Under the ionising radiation regulations 1999 the group of people whose annual radiation dose limit is 6 mSv are:
- classified workers
- trainees
- pregnant females
- members of the general public
Under the ionising radiation regulations 1999 the annual dose limit to the lens of the eye of an employee aged 18 or over is:
- 20 mSv
- 150 mSv
- 1 Sv
- 150 mSv
The law that can be stated as: is called:
- the Bunsen Roscoe reciprocity law
- the inverse square law
- the build-up law
- Hooke’s law
A general term for the reduction in radiation intensity due to a given thickness of shielding is:
- transmission factor
- linear absorption coefficient
- half value thickness
- nuclear cross section
The proportion of scattered radiation increases as:
- the photon energy of the primary beam decreases
- the photon energy of the primary beam increases
- the intensity of the primary radiation decreases
- the intensity of the primary radiation increases
When performing gamma radiography in a radiation enclosure the radiographer should as a minimum check the radiation dose rate:
- occasionally
- at the beginning and end of each 8 hour shift
- before and after every exposure of the source
- there is no need to check the dose rate if the radiographer is wearing a film badge or TLD
1000 GBq is equal to:
- 1,000,000 Bq
- 100 MBq
- 1 TBq
- 15 Ci
Gamma ray equipment including wind-outs and projection tubes must be checked for leakage of fissile material on a regular basis; records of such checks must be maintained on file for a period of at least 2 years. The type of radiation monitor that is usually used for such checks is a:
- Geiger counter
- scintillation counter
- proportional counter
- ionisation chamber
The document which must be available at all work sites where industrial radiography is performed is:
- the ionising radiation regulations 1999
- the local rules
- BS EN 1435
- BS EN 444
Under the ionising radiation regulations the category of persons which has an annual dose limitation of 20 mSv is:
- trainees
- classified persons
- radiation protection advisers
- the general public
The maximum photon energy of the gamma rays produced by cobalt 60 is approximately:
- 500 keV
- 800 keV
- 1200 keV
- 1600 keV
The official document reference for the ionising radiation regulation regulations 1999 is:
- SI 2323
- SI 3223
- SI 2332
- SI 3232
One important factor concerning the warning signals used when performing radiography on site is that:
- a combination of audible and visible signals must be used
- audible and visible signals must be used both before and during exposure
- the warning signal signifying “radiation exposure imminent” and the warning signal signifying “radiation exposure in progress” must be different
- an audible warning of at least 120 decibels is required prior to exposure
If the dose rate at 10 m from a source of radiation is 20 mSv/h the distance from the source at which the dose rate falls to 7.5 mSv/h will be:
- 4 m
- 3 m
- 9 m
- 8 m
Before starting industrial radiography at any location the employer must notify the HSE. The minimum notification period is:
- 12 weeks (84 days)
- 2 weeks (14 days)
- 4 weeks (28 days)
- 6 weeks (42 days)
The term used to describe a large dose of ionising radiation received in a relatively short period is:
- an acute exposure
- a somatic exposure
- a genetic exposure
- a brief exposure
One advantage of the Geiger Muller tube is that:
- its volume is relatively small. This makes it useful for locating leakage paths in radiation bay shielding.
- it operates at a low electrical voltage. Typically 12 V.
- it can distinguish between high energy and low energy x-rays
- it is exceptionally sensitive to alpha radiation
The device used in gamma radiography to restrict the size of the radiation beam, thus improving safety and reducing scatter problems is called a:
- focusing cup
- collimator
- mask
- diaphragm
Devices which record total radiation dose over a period include TLD badges, film badges and:
- scintillation counters
- electronic integrating personal dosimeters
- quartz fibre electroscopes
- both (b) and (c)
In order to obtain a reading of radiation dose from a TLD badge the badge must be:
- heated
- exposed to UV-A radiation
- placed in a powerful magnetic field
- placed in a high voltage electric field
The local rules must contain:
- a description of a controlled area
- a description of a supervised area
- names and contact details of persons designated as radiation protection supervisors
- all of the above
Factors that affect the half life of a radioactive isotope include:
- the source activity
- storage conditions
- the source size
- none of the above
The function of the metal filters in a film badge holder is to:
- discriminate between different photon energies of x and gamma radiation
- extend the measuring range of the badge
- both (a) and (b)
- none of the above
In general the maximum interval between leak tests for a sealed source should be:
- 6 months
- 1 year
- 2 years
- 5 years
It is generally recommended that radiation dose rate meters should be calibrated at intervals not exceeding:
- 6 months
- 1 year
- 2 years
- 5 years
100 REM is equivalent to:
- 1 mSv
- 100 mSv
- 1 Sv
- 10 Sv
The material which in general provides the best and most economic engineering solution to the problem of shielding a radiation bay used for cobalt 60 gamma rays is:
- steel
- concrete
- brass
- lead
A radiation source container is marked “RADIOACTIVE II”, the II is in red letters. The red II means that:
- the dose rate at the surface of the container does not exceed 10 mSv/h
- the dose rate at the surface of the container does not exceed 1 mSv/h
- the source stored in the container is Iridium 192
- the dose rate at 1 metre from the container does not exceed 10 mSv/h
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