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SPE102: Radiation Safety Physics > Regulations > Flashcards

Regulations Flashcards

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1
Q

What legislation specifies the dose limits to staff and the public?

A

IRR17

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2
Q

What are the whole body dose limits set out in IRR17 for:

a) Employees (>18yo)
b) Employees (<18yo)
c) Women of child-bearing age.
d) Pregnant staff.
e) General Public

A

a) 20mSv/yr
b) 6mSv/yr
c) 13mSv for any consecutive period of 3 months
d) 1mSv to the foetus for the declared duration of the pregnancy
e) 1mSv

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3
Q

What are the dose limits allowed for Employees (>18yo):

a) to the lens of the eye
b) to the skin
c) to the extremities

A

a) 20mSv
b) 500mSv averaged over 1cm^2
c) 500mSv

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4
Q

What are the dose limits allowed for Employees (<18yo):

a) to the lens of the eye
b) to the skin
c) to the extremities

A

a) 15mSv
b) 150mSv averaged over 1cm^2
c) 150mSv

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5
Q

What are the dose limits allowed for Other Persons:

a) to the lens of the eye
b) to the skin
c) to the extremities

A

a) 15mSv
b) 50mSv averaged over 1cm^2
c) 50mSv

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6
Q

What are the duties of the Practitioner under IR(ME)R?

A

“The practitioner shall be responsible for the justification of a medical exposure and such other aspects of a medical exposure as is provided for in [IR(ME)R].”

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7
Q

What are the duties of the Operator under IR(ME)R?

A

“The operator shall be responsible for each and every practical aspect which he carries out as well as for any authorization given pursuant to regulation 6(5) (in the absence of a practitioner) where such authorization is not made in accordance with the guidelines referred to in regulation 6(5).”

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8
Q

What are the duties of the Referer under IR(ME)R?

A

“The referrer shall supply the practitioner with sufficient medical data (such as previous diagnostic information or medical records) relevant to the medical exposure requested by the practitioner to enable the practitioner to decide on whether there is a sufficient net benefit as required by regulation 6(1)(a).”

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9
Q

Which legislation contains information about the appointment and duties RPAs and RPSs?

A

IRR17

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10
Q

Which legislation contains information about Medical Physics Experts?

A

IR(ME)R

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11
Q

What is the hierarchy of radiation protection?

A
  1. Engineering Controls
  2. Systems of Work
  3. PPE
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12
Q

Which legislation specifies the hierarchy of radiation protection?

A

IRR17

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13
Q

What is meant by “Justification” in terms of Radiation Safety?

A

No practice involving exposures to radiation should be adopted unless it produces sufficient benefit to the exposed individuals to offset the detriment it causes.

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14
Q

What is meant by “Optimisation” in terms of Radiation Safety?

A

The magnitude of individual doses, the number of people exposed… should be kept as low as reasonably achievable, (ALARA principle) with economic and social factors being taken into account.

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15
Q

What is meant by “Limitation” in terms of Radiation Safety?

A

The exposure of individuals should be subject to dose limits. These are aimed at ensuring that no individual is exposed to radiation risks that are judged to be unacceptable…in any normal circumstances

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16
Q

Who enforces IRR17 compliance?

A

Health and Safety Executive

17
Q

What are the dose rates that designate a controlled area?

A

IDR: >2000microSv/hr
TADR: >7.5microSv/hr
TADR2000: >3microSv/hr

18
Q

What are the dose rates that designate a supervised area?

A

IDR: >7.5microSv/hr
TADR: >2.5microSv/hr
TADR2000: >0.5microSv/hr

19
Q

What are the dose rates that designate an unsupervised/public area?

A

IDR: >7.5microSv/hr
TADR: >0.5microSv/hr
TADR2000: >0.15microSv/hr

20
Q

What are the minimum requirements for a set of local rules?

A

Description of controlled and supervised areas
Name and contact details of the RPS
Arrangements to restrict access
Conditions of entry for non-classified workers
Instructions for safe working practice
Dose investigation levels
Contingency plans

21
Q

What are the duties of the Radiation Protection Advisor?

A

Gives advice to employer on radiation safety including:

  • Implementation of requirements for controlled and supervised areas
  • Advice on plans for future radiation installations, modifications, design and safety features.
  • Calibration and proper use of equipment for monitoring radiation.
  • Periodic testing of control and safety features and systems of work
22
Q

What qualities make a good Radiation Protection Supervisor?

A

Full time employee in department
Sufficiently senior to ensure compliance.
Needs to liaise frequently with RPA

23
Q

What information must be given to a comforter and carer before they take on the role?

A

Must be informed of risks
Must be informed of special procedures to restricts their exposure.
Must willingly accept the dose and risk involved

24
Q

What is the dose limit of a comforter and carer?

A

No limit by 5mSv per episode constraint

25
Q

Who enforces IR(ME)R?

A

Care Quality Commision

26
Q

What are the general principles of Radiation Protection set out in IR(ME)R?

A
  • All diagnostic procedures may carry some personal risk
  • Only necessary medical exposures should be carried out
  • Alternative methods, eg. using non-ionising radiation should be considered
  • All medical exposures must be justified (risk v benefit)
  • Diagnostic exposures as low as reasonably practicable (ALARP)
27
Q

What is the minimum information the referrer must supply?

A

Unique patient identifier
Clinical information to justify the exposure
Information regarding pregnancy (last period, breastfeeding)
Signature

28
Q

Explain what is meant by a Diagnostic Reference Level.

A
  • Must be established for each standard diagnostic and nuclear medicine examination for a standard patient cohort
  • May be based on patient doses measured within a QA programme, but should also take into account of national guidelines
  • Expressed in dos quantities (entrance surface dose, screening time, mAs, DAP etc.. depending on the type of equipment and examination)
  • Reviewed at least every three years or when changes are made to equipment or procedures
  • Investigation required if patient doses regulary exceed DRL
29
Q

What types of radiation incidents are reported to the HSE?

A

Malfunctions/defects in equipment

30
Q

What types of radiation incidents are reported to CQC?

A

Human error

31
Q

What is the reporting limit for low dose (<0.5mSv) nuclear medicine, extremity X-Ray examinations?

A

20x intended dose

32
Q

What is the reporting limit for medium dose (0.5-5mSv) nuclear medicine scans, or med dose X-Ray (spine, abdomen, pelvis, mammography) examinations?

A

10x intended dose

33
Q

What is the reporting limit for high dose (>5mSv) nuclear medicine scans, or high dose X-Rays (Interventional Radiograph, CT, Fluoroscopy, Angiography, Ba meals/enemas?

A

1.5 intended dose

34
Q

What is the maximum allowed X-Ray leakage?

A

1mGy/hr at 1m from focal spot averaged over 100cm^2

35
Q

What is the minimum required tube filtration for normal diagnostic work?

A

2.5mm Al equivalent (1.5 Al should be permanent)

36
Q

What is the minimum required tube filtration for mammography?

A

0.5mm Al equivalent

SPE102: Radiation Safety Physics (6 decks)

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