Separate sterilisation, imaging and treatment jobs
Sterilise → ultraviolet; image or inspect → X-rays; medical treatment → gamma rays.
Continue where you stopped
The core idea
Wave · Lesson 4 of 4 · about 25–35 min
What you need to understand
Sterilise → ultraviolet; image or inspect → X-rays; medical treatment → gamma rays.
Definitions
- radiological imaging
- using X-rays to produce an image for medical examinationFor example: A radiological image can show a broken bone.
Key idea
- LookA cabinet sterilises equipment, a radiographer images a broken bone, and a hospital provides the prescribed radiation treatment. Name the wave for each job.
- ThinkSterilise → ultraviolet; image or inspect → X-rays; medical treatment → gamma rays.
- DoRetrieve the prescribed wave from a sterilisation, imaging, engineering-inspection or medical-treatment context.
Explanation
Use three short associations: ultraviolet for sterilisation and sunbeds; X-rays for radiological imaging and engineering inspection; and gamma rays for medical treatment.
Changed wording does not change the association. Equipment being made free of microbes is a sterilisation context, a hidden crack found without opening a component is an engineering-inspection context, and radiation used as a treatment is the gamma-ray example.
Pause and say it: Sterilise → ultraviolet; image or inspect → X-rays; medical treatment → gamma rays.
Common mistake
Tempting wrong idea: Microwaves are the prescribed wave for sterilisation.
Why it fails: Microwaves are used to heat food, not to sterilise. In this syllabus, ultraviolet is used for sterilisation, X-rays for radiological imaging and gamma rays for medical treatment.
Use this instead: Ultraviolet, not microwaves, is the prescribed wave for sterilisation in this syllabus.
Practical work
What to show: Retrieve the prescribed wave from a sterilisation, imaging, engineering-inspection or medical-treatment context.
Before you finish: Changed wording still describes an engineering application of X-rays.
Practical link: The topic investigation is taught in “Measure a wave correctly”.
6. Worked examples
Modelled example 1
Choose waves for three different jobs
Problem
A cabinet sterilises equipment, a radiographer images a broken bone, and a hospital provides the prescribed radiation treatment. Name the wave for each job.
Study the worked solution
Use the job words
Method
Separate sterilisation, imaging and treatment.Reason
The three contexts have different prescribed associations even when they occur in healthcare.
Working
sterilisation → ultraviolet; radiological image → X-rays; medical treatment → gamma rays
Guided practice 2
Match inspection, sunbed and treatment contexts
Problem
Match each context to ultraviolet, X-rays or gamma rays: a sunbed; an engineer checks a sealed component for an internal flaw; a patient receives the named radiation treatment.
Write three pairings
Hints
Hint 1: use the extra ultraviolet example
Sunbeds are listed with sterilisation.
Hint 2: separate inspection from treatment
Engineering inspection uses X-rays; medical treatment uses gamma rays.
View solution step by step
Retrieve the prescribed pairings
Method
Separate the sunbed, engineering-inspection and treatment contexts.
Reason
Each context names one of the three prescribed application associations.
Working
sunbed → ultraviolet; engineering inspection → X-rays; medical treatment → gamma rays
Common misconception 3
Correct three mixed-up jobs
Learner response
“Microwaves sterilise equipment, infrared makes a radiological image, and X-rays are the named medical treatment.” Correct all three pairings.
Replace each wave
View solution step by step
Match the job, not merely a familiar technology
Method
Replace every swapped wave with the wave named for that application.
Reason
Sterilisation, radiological imaging and medical treatment are distinct prescribed contexts.
Working
sterilisation → ultraviolet; radiological image → X-rays; medical treatment → gamma rays
Challenge 4
Classify a clinic and workshop schedule
Problem
A clinic makes equipment ready by sterilising it and later provides radiation treatment. Next door, a workshop checks a weld for an internal defect. Name the prescribed wave for each job.
Classify all three jobs
Hints
Hint 1: separate treatment from inspection
Medical treatment and engineering inspection use different named waves.
Hint 2: retrieve the three pairings
Sterilisation uses ultraviolet, treatment uses gamma rays and inspection uses X-rays.
View solution step by step
Recognise the same applications in new wording
Method
Match each reworded job to its prescribed application association.
Working
sterilising equipment → ultraviolet; medical treatment → gamma rays; engineering inspection → X-rays
Reason
No additional electromagnetic-wave property is needed; each context rephrases a prescribed use.
Guided practice
Try it with support
Choose the prescribed wave for each use: sterilising equipment, imaging a broken bone and medical radiation treatment.
- Match the verbs sterilise, image and treat separately.
Check the guided answer
Answer: Ultraviolet is used for sterilisation, X-rays for radiological imaging and gamma rays for medical treatment.
Check: The three jobs are not interchangeable merely because they may occur in a hospital.
Practise and continue
Practise this
An engineer checks a sealed metal component for a hidden flaw without opening it. Which prescribed wave applies, and how is that job different from the gamma-ray example?
Need a hint?
- Classify the context as inspection rather than treatment.
Check your answer
Answer: X-rays are prescribed for engineering inspection. Gamma rays are instead prescribed for medical treatment.
Check: Changed wording still describes an engineering application of X-rays.
Think like a scientist
A learner swaps ultraviolet sterilisation, X-ray radiological imaging and gamma-ray medical treatment. Correct all three associations.
Check the reasoning
Ultraviolet—sterilisation; X-rays—radiological imaging; gamma rays—medical treatment.
Remember: Sunbeds are also a prescribed ultraviolet use, while engineering inspection is also a prescribed X-ray use.
One-minute check
- Hide the page and explain separate sterilisation, imaging and treatment jobs in your own words.
- Give a new example that is different from the worked example.
- Correct this common mistake: “Microwaves are the prescribed wave for sterilisation.”