physics

Radiation protection of patients

Radiation protection of patients is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Radiation protection of patients rather than just read about it. In short: In medicine, patients are exposed to ionizing radiation when they undergo diagnostic examinations using x-rays or radiopharmaceuticals. Radiation is also used in therapy for cancer, and also in interventional procedures using fluoroscopy.

Key takeaways

Radiation protection of patients belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Radiation protection of patients to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Radiation protection of patients from memory before moving on to harder problems.

Reference excerpt

In medicine, patients are exposed to ionizing radiation when they undergo diagnostic examinations using x-rays or radiopharmaceuticals. Radiation is also used in therapy for cancer, and also in interventional procedures using fluoroscopy. Patients are protected from excess radiation in medicine primarily by the design safety measures, safety practices that reduce the risk of overdose, reducing routine dosages used, and reducing total number of investigations. Lead shielding is no longer recommended for dental X-rays or for gonadal shielding.

History In 2002 International Atomic Energy Agency (IAEA) established an action plan on the radiological protection of patients in recognition of the increasing importance of this topic. The emphasis in the past had been on radiation protection of staff and this has helped to reduce radiation doses to staff at levels well below the limits prescribed by the International Commission on Radiological Protection (ICRP) and accepted by most countries. The recent emphasis on radiation protection of patients is helping in developing strategies to reduce radiation doses to patients without compromising on diagnostic or therapeutic purpose. In response to increased concern by the public over radiation doses and the ongoing progress of best practices, The Alliance for Radiation Safety in Pediatric Imaging was formed within the Society for Pediatric Radiology. In concert with the American Society of Radiologic Technologists, the American College of Radiology, and the American Association of Physicists in Medicine, the Society for Pediatric Radiology developed and launched the Image Gently campaign which is designed to maintain high quality imaging studies while using the lowest doses and best radiation safety practices available on pediatric patients in 2013. This initiative has been endorsed and applied by a growing list of various professional medical organizations around the world and has received support and assistance from companies that manufacture equipment used in radiology. Following upon the success of the Image Gently campaign, the American College of Radiology, the Radiological Society of North America, the American Association of Physicists in Medicine, and the American Society of Radiologic Technologists have launched a similar campaign to address this issue in the adult population called Image Wisely. The World Health Organization and International Atomic Energy Agency (IAEA) of the United Nations have also been working in this area and have ongoing projects designed to broaden best practices and lower patient radiation dose.

ALARA "ALARA" ("As Low As Reasonably Achievable") should be maintained to reduce radiation doses to staff as well as patients.

Lead shielding during routine X-rays and CT scans

Starting in the 1950s, lead shielding began to be used on patients during all X-rays over the abdomen to protect the gonads (reproductive organs) or a fetus if the patient was pregnant. Dental X-rays would also typically additionally use lead shielding to protect the thyroid. However, a consensus was reached between 2019 and 2021 that lead shielding for routine diagnostic X-rays is not necessary and may in some cases be harmful. In part, this is due to improved understanding of the effects of radiation on patients, as the amount of radiation patients were exposed to in routine X-rays and CT scans was found to be negligible enough to warrant functional harmlessness in fertility or a developing pregnancy. It was also due to the improvement of X-ray machines. For instance, older X-ray machines would use a set amount of radiation, and used film which requires more X-rays. Modern X-ray machines are digital, and automatically use the minimum amount of radiation needed to image the patient, which means overall the radiation levels are much lower than in the past; however, if the lead shield is in the field being imaged, the machine will produce more X-rays in order to attempt to penetrate the lead shield. Additionally, if the shield is in the field, this may affect the image produced, requiring a second X-ray to be performed, which would also lead to overall increased radiation exposure. Additionally, patient shielding is ineffective at reducing internal scatter; because only a portion of the patient is shielded, X-rays may still go through the gonads or fetus from bouncing off the imaged areas internally. Lead shielding is still recommended for other people in the room, such as family members, health professionals, and X-ray technicians, as it reduces the amount of radiation received. Unlike with patients, there's no risk of increased radiation from using shielding since the use of shielding does not increase the amount of X-rays being produced by the machine as there is no potential for it to accidentally end up in the field. Additionally, health care professionals may be performing many X-rays a day, meaning they are exposed to more cumulative radiation, unlike patients who typically receive far fewer.

See also Journal of Radiological Protection International Radiation Protection Association European Committee on Radiation Risk

References

External links Radiation Protection of Patients site of the IAEA International Atomic Energy Agency official site

Illustrations

Worked examples

Example 1 — a first encounter with Radiation protection of patients

Start with the simplest possible case. Write down what Radiation protection of patients claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Radiation protection of patients before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Radiation protection of patients ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Radiation protection of patients

In research: Radiation protection of patients appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Radiation protection of patients in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Radiation protection of patients is common in secondary-school and first-year university syllabi. It links to neighbouring topics International Atomic Energy Agency, Radiation health effects, Radiation protection, so understanding it makes those chapters shorter.
In everyday life: Look for Radiation protection of patients outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Radiation protection of patients in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Radiation protection of patients means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Radiation protection of patients out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Radiation protection of patients in simple terms?

Why does Radiation protection of patients matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Radiation protection of patients?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Radiation protection of patients.