Transcript Medical Exposure Protection

Radiation Safety Regulations
Part VI: Medical Exposure Protection
Medical Exposure Protection
Contents (1/2)
General Responsibilities
 Justification of medical exposure
 Optimisation of protection for medical
exposures
 Calibration
 Quality assurance
 Guidance levels

Medical Exposure Protection
Contents (2/2)
Dose constraints
 Maximum activity for patients in therapy
on discharge from hospital
 Investigation of accidental medical
exposures
 Records

Medical Exposure Protection
General Responsibilities
All medical exposures shall be
prescribed by a medical practitioner
 Medical practitioners ensure overall
patient protection in prescription of, and
during delivery of, medical exposure
 Sufficient qualification and training of
personnel (as approved by the RA)

Medical Exposure Protection
Justification of medical exposure
Responsibility of the prescriber
 Alternative techniques
 Examinations undertaken for
occupational, legal or health insurance
purposes
 Mass screening
 Exposure of humans for medical
research

Medical Exposure Protection
Optimisation of protection for medical
exposures
Design of sources and equipment
 Operational aspects

(See Annex 4 of TECDOC 1067)
Medical Exposure Protection
Calibration
Sources used for medical exposure
traceable to a Standards dosimetry
laboratory
 radiotherapy equipment are
appropriately calibrated
 radio-pharmaceuticals are calibrated in
terms of activity to be administered
 calibrations at commissioning, after
maintenance and at regular intervals
approved by the RA

Medical Exposure Protection
Clinical dosimetry

Representative values of clinical
dosimetry parameters shall be
determined and documented
Medical Exposure Protection
Quality assurance

Quality assurance programme for medical
exposures shall be established
 measurement
of pysical parameters of
radiation generators, imaging devices and
irradiation installations periodically
 verification of physical and clinical factors
used in patient diagnosis and treatment
 written records of relevant procedures and
results
 verification of calibration
 independent quality audit reviews
Medical Exposure Protection
Dose constraints
Persons exposed to medical research
purposes not producing direct benefit to
exposed individual
 Voluntary help in care, support and
comfort
 Visitors to patients

Medical Exposure Protection
Guidance levels
Revised as technology improves
 Corrective actions taken if substantially
below guidance levels; ineffective
diagnostic information or insufficient
therapeutic dosage
 Reviews if guidance level are exceeded;
input to optimised protection and
maintaining levels of good practice

Medical Exposure Protection
Maximum activity for patients in
therapy on discharge from hospital
Protection of members of the household
of a patient and other members of the
public
 Written radiation protection instructions
to the patient

Investigation of
accidental medical exposure
Licensee shall promptly investigate
incidences
wrong patient, tissue, pharmaceutical,
dose differing substantially from that
prescribed or intended
 doses repeatedly and substantially
exceeding the guidance levels
 repeated failure or other unusual
occurrence with potential for causing
unintended doses

Investigation of
accidental medical exposure
Licensee shall take action to
estimate the dose received
 take measures to prevent reoccurrence
 notify the Regulatory Authority
 inform the patient and his/hers doctor

Medical Exposure Protection
Records
Licensee shall keep and make available
 Equipment calibration, clinical dosimetry,
quality assurance
 Necessary information for retrospective
assessments of doses

References
IAEA BSS, Safety Series
No 115