Basic principles and legal framework
Radiation safety is built on two key principles. The first is the optimization principle, which requires keeping the radiation dose as low as reasonably achievable without compromising the quality of diagnostic information or therapeutic effect. The second is the standardization principle, which involves strict compliance with hygienic dose limits.
Safety is regulated by a number of normative acts, including the Federal Laws "On the Sanitary and Epidemiological Welfare of the Population" and "On Radiation Safety of the Population", as well as specialized sanitary rules (SanPiN 2.6.1.1192-03). Not only specialized professionals (radiologists and radiotherapists), but absolutely all physicians referring patients for diagnostic imaging must know these regulations. A patient always has the right to unhindered access to information about their dose and potential consequences, and may also refuse the procedure. The only exceptions are preventive screenings aimed at detecting epidemiologically dangerous diseases.
Requirements for personnel and patients
Staff members directly working with radiation sources belong to Category A personnel. Individuals over 18 years of age who have no medical contraindications, have undergone specialized training and briefings, and are officially appointed by order are allowed to perform such work. Regular medical monitoring is a mandatory requirement. If a staff member is pregnant or breastfeeding, she is exempt from working with X-ray equipment for the entire duration.
The administration of the medical institution bears full responsibility for the safety of the process. Management appoints individuals responsible for radiation control, accounting, and storage of equipment. Sometimes, when examining severely ill patients or children, assistance from third parties (anesthesiologists, nurses from other departments, or relatives) is required. For this category, the radiation burden is strictly limited: the effective dose must not exceed 5 mSv/year.
Personal protective equipment (PPE)
Stationary, mobile, and individual protective equipment are used to reduce the radiation burden. Modern PPE is manufactured from high-tech composites (e.g., rubber with added rare-earth element oxides) or textiles with chemically bound lead. They are significantly lighter than old leaded rubber, durable, and non-toxic.
Special attention is paid to preventing lead poisoning among personnel:
- The presence of exposed lead surfaces in the room is strictly prohibited — stationary protection is coated with a double layer of oil or enamel paint.
- Lead protective clothing must be placed in film or oilcloth covers.
- The use of PPE with an expired shelf life is unacceptable.
- Leaded rubber gloves are worn only over thin cotton ones.
- After removing protection, personnel must wash their hands with warm water and soap or special protective preparations.
- Eating, smoking, and using cosmetics are strictly prohibited in the procedural area.
Sanitary and technical regime of the X-ray room
The equipment must completely eliminate the risk of electric shock: current-carrying circuits are securely hidden, and grounded communications accessible to accidental touch (e.g., heating radiators) are covered with insulated shields. The noise level from the equipment is also monitored: it must not exceed 50 dBA in standby mode and 60 dBA when the equipment is running.
The sanitary regime requires that all contact parts of the equipment be resistant to repeated wet cleaning. Routine wet cleaning of the room is carried out exclusively after the end of the work shift — mopping the floors before or during patient appointments is strictly prohibited. Once a month, special surface treatment is performed using a 1–2% acetic acid solution.
To ensure fire safety, the room is equipped with carbon dioxide fire extinguishers with unobstructed access to them. It is strictly prohibited to use open flames, store defective images openly, or stack films near windows, lamps, or heating appliances. Commissioning of the room is possible only after a commission inspection, obtaining a license, and issuing a sanitary-epidemiological conclusion (SEC).
Briefly: answers to topical questions
What are the effective radiation dose limits for Category A and Category B personnel?
Effective radiation dose limits vary depending on the category of exposed individuals and are regulated by radiation safety standards. For Category A personnel, the effective dose is 20 mSv per year averaged over any 5 consecutive years, but not more than 50 mSv in any single year. For Category B personnel, the effective dose is 5 mSv per year averaged over any 5 consecutive years, but not more than 12.5 mSv in any single year.
What main regulatory documents govern radiation safety in medicine?
Radiation safety in medicine is regulated by the following key regulatory and legal documents: the Federal Law "On the Sanitary and Epidemiological Welfare of the Population", SanPiN 2.6.1.1192-03 "Hygienic requirements for the design and operation of X-ray rooms, equipment, and X-ray examinations", as well as the Law "On Radiation Safety of the Population". Knowledge of these regulatory documents is mandatory for all physicians ordering diagnostic X-ray and radiological examinations.
What categories of exposed individuals exist in medical exposure?
During radiation exposure, the following categories of exposed individuals are distinguished: Category A personnel, including those directly working with ionizing radiation sources; Category B personnel, consisting of individuals who, under working conditions, are within the exposure area of ionizing radiation; and the general public.
The "Two NOs" rule for personnel: NO food, smoking, or cosmetics in the room; NO exposed lead and no working without protective covers.
Class and exam questions
Can a patient refuse an X-ray scan?
The patient has the right to refuse medical examination. The only exceptions are preventive examinations to detect diseases that are dangerous from an epidemiological standpoint.
How to properly maintain the room to avoid lead accumulation?
Exposed lead surfaces must be covered with a double layer of oil or enamel paint. Cleaning is carried out only after the shift, and once a month the room is washed with a 1–2% acetic acid solution.
What else to study on this topic
- Procedure for obtaining a sanitary-epidemiological conclusion for equipment.
- Classification and physicochemical properties of modern composite PPE.
- Optimization of physical and technical parameters of X-ray equipment to reduce dose.
- Requirements for stationary shielding and layout of diagnostic imaging rooms.
Master the entire topic in the "Hygiene" course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on "Protection against ionizing radiation" and 530 more pages of the subject
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 95 video lessons for the subject
Other topics in "Chapter 7. Basics of radiation hygiene"
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.