Radiology - Technology Information PortalTuesday, 19 February 2019



Radiology Safety
Intro and Safety Rules

  • Intro and Safety Rules
'Safety' in Radiology News (14) and in Radiology Resources (8) 
Radiation Safety 

Radiation safety concerns the safe use of ionizing radiation. The radiation exposure has to be controlled to protect people and the environment from unnecessary exposure and the damaging effect to the health. Legal regulations require that radiation exposure (individual radiation exposure as well as collective dose) must be kept as low as reasonably achievable.
The electromagnetic spectrum includes x-rays, gamma rays, ultraviolet radiation, visible light, infrared radiation, and radio waves. Additionally, there are several types of particulate radiation e.g., alpha and beta particles. All types of radiation are used in a wide range of medicine, industry, research and communication. Radiation risks can occur due to either long-term low level exposure or short-term high level exposure. A well-functioning dosimetry program is essential for a safe use and for compliance with federal and state regulations.

Three basic rules have to be observed for a safe use of ionizing radiation.
point Keep a radiation source at high distance. A doubled distance reduces the exposure by a factor of four.
point Minimize the time near a source of radiation.
point Optimize radiation shielding to absorb radiation. The greater the shielding around a radiation source, the smaller the exposure.

See also Inverse Square Law, Administrative Dose Guidelines and Annual Dose Limit.

• View the NEWS results for 'Radiation Safety' (1).Open this link in a new window. 

• View the DATABASE results for 'Radiation Safety' (5).Open this link in a new window.

  Further Reading:
Introduction to Radiation SafetyOpen this link in a new window
'Radiography is an important tool in nondestructive evaluation. The method offers a number of advantages over other NDE methods, ...'
As Low As Reasonably Achievable 

(ALARA) 'As low as reasonably achievable' is a precautionary principle that should be part of basic radiation safety considerations in protection to the exposure as well as in other technologies of the medical, the nuclear and the industrial fields.
ALARA is based on three principles:
point justification,
point protection of the individual,
point optimization of protection.
Justification means that possible exposure to humans should yield a sufficient benefit to society to justify the risks of the radiation exposure. The ICRP in 1977 states that 'all exposures shall be kept as low as reasonably achievable, economic and social factors being taken into account'. The radiation exposure must be reduced to the lowest level possible, considering the costs of such a limitation in dose.

• View the DATABASE results for 'As Low As Reasonably Achievable' (5).Open this link in a new window.

  Further Reading:
Computed Tomography ? An Increasing Source of Radiation ExposureOpen this link in a new window
'The advent of computed tomography (CT) has revolutionized diagnostic radiology. Since the inception of CT in the 1970s, its use ...'
Thursday, 29 November 2007 by    

Dosage is an important factor in the use of ionization radiation as well as in application of contrast agents or radiopharmaceuticals and the dosage should be comply with the ALARA principle (As Low As Reasonably Achievable).
Ionizing radiation comes from natural and artificial sources. Radiation effects depend on the type of radiation, and various units are used for measurement of dosages including gray, sievert, radiation absorbed dose (RAD), roentgen equivalent in man (REM), and roentgen. The amount of radiopharmaceutical given to a patient is measured in becquerels (Bq).
The dosage of contrast media in radiographic or computer-tomographic procedures should be tailored according to the diagnostic indications, the iodine concentration, and the patient's body size and age.
See also Administrative Dose Guidelines.

• View the DATABASE results for 'Dosage' (32).Open this link in a new window.

  Further Reading:
Weight-based intravenous contrast injection parameters for Enhanced CT ScanningOpen this link in a new window
'What is this page all about? It's for radiologists to use for CT scanning ( "cat scans" or "computed tomography"). It's like a ...'
Radiation DosagesOpen this link in a new window
'Ionizing radiation comes from natural and artificial sources. The energy absorbed from exposure to radiation is called a dose. ...'
Dose Limit 

The dose limit is the highest value of an applied or allowed radiation exposure. The radiation dose is limited in order to prevent the occurrence of radiation-induced deterministic effects or to limit the probability of radiation-related stochastic effects to an acceptable level.
See also Whole Body Counter, Thermoluminescent Dosimeter, Dosimetrist, Annual Limit On Intake, Committed Effective Dose Equivalent, Computed Tomography Dose Index, Directional Dose Equivalent, Doubling Dose.

• View the NEWS results for 'Dose Limit' (1).Open this link in a new window. 

• View the DATABASE results for 'Dose Limit' (5).Open this link in a new window.

Administrative Dose Guidelines 

The administrative dose guidelines are the predetermined value of radiation dose to workers, below the dose limit (administrative level), which triggers a specific course of action when the dose value is exceeded, or is expected to be exceeded.
See also Medical Internal Radiation Dose Committee, Food and Drug Administration, Material Safety Data Sheet, Annual Dose Limit, Air Kerma, Supervised Area and Drug Development and Approval Process USA.

• View the DATABASE results for 'Administrative Dose Guidelines' (3).Open this link in a new window.

  Hazards and Protection top
Nothing is wrong with California that a rise in the ocean level wouldn't cure.
- Ross MacDonald
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