GCC Nursing Guide — Radiation Protection & Safety

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Types of Ionising Radiation

Type	Source in Healthcare	Penetration
X-rays	Radiology, fluoroscopy, CT	High — penetrates tissue
Gamma rays	Nuclear medicine, radiotherapy, brachytherapy	Very high — requires lead/thick concrete
Alpha particles	Sealed/unsealed sources (rare clinical)	Very low — stopped by skin / paper; hazardous if inhaled
Beta particles	I-131 therapy, PET tracers	Low — stopped by perspex/plastic; skin dose risk

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Radiation Units — Quick Reference

Gray (Gy)Absorbed dose — energy deposited per kg tissue

Sievert (Sv)Effective dose — risk-weighted (accounts for radiation type & organ sensitivity)

millisievert (mSv)1/1000 Sv — practical occupational & diagnostic unit

Becquerel (Bq)Activity — 1 radioactive decay per second (nuclear medicine)

For X-rays and gamma rays: 1 Gy = 1 Sv (weighting factor = 1). For alpha particles: 1 Gy = 20 Sv.

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Background & Diagnostic Radiation Doses

Background Radiation

2.7 mSv/yr

UK average (radon, cosmic, food, terrestrial). UAE average slightly lower. Context for patient counselling.

Common Diagnostics

CXR (PA)0.02 mSv

CT Chest8 mSv

CT Abdomen10 mSv

Coronary Angio7 mSv

More Diagnostics

PET-CT25 mSv

Bone Scan6 mSv

Barium Swallow3 mSv

Brain MRI0 mSv

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Radiation Risk Types

Deterministic Effects (Threshold-based) ▼

Occur only above a threshold dose — severity increases with dose above threshold
Cataracts: threshold ~500 mGy (occupational lens dose limit now 20 mSv/yr)
Skin erythema: ~2 Gy absorbed dose
Hair loss: ~3–5 Gy to scalp
Bone marrow suppression: >1 Gy whole-body
Relevance: long fluoroscopy procedures, radiotherapy skin reactions

Stochastic Effects (No Threshold) ▼

No safe dose — probability (not severity) increases with dose
Cancer: primary stochastic risk — leukemia, solid tumours
Hereditary effects: mutations in germ cells (very low probability)
Used as justification for ALARA principle and dose limits
BEIR VII model: ~1 in 1000 risk of fatal cancer per 100 mSv

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ALARA Principle

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As Low As Reasonably Achievable — the fundamental principle of radiation protection. Every dose reduction achievable without compromising clinical benefit must be implemented.

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Time

Minimise time near radiation source. Dose is directly proportional to time of exposure.

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Distance

Inverse square law: double distance = quarter dose. Step back during X-ray/DSA runs.

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Shielding

Lead aprons, thyroid collars, lead screens, architectural shielding in X-ray rooms.

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Legal & Regulatory Framework — GCC

UAE Federal

UAE Federal Radiation Regulations (Federal Authority for Nuclear Regulation — FANR)
Radiation Protection Manual — facility-specific implementation
All sources licensed; use authorised by Radiation Protection Officer (RPO)

DHA / DOH Standards

Dubai Health Authority (DHA) radiology department standards
Department of Health Abu Dhabi (DOH) radiology policy
Mandatory staff dosimetry and annual review
Pregnant worker reassignment protocols mandated

International Basis

ICRP Publication 103 (2007) — current dose limit framework
IAEA Safety Standards — adopted by GCC regulators
WHO and EU BSS (Basic Safety Standards) inform GCC policy

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Lead Aprons

Lead equivalence0.25–0.5 mm Pb equivalent

Preferred typeFull wrap-around (front + back protection)

StorageHang — NEVER fold (cracks reduce shielding)

Annual inspectionFluoroscopy check for cracks — documented

Defective apronLabel and remove from use immediately

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Lead aprons do not protect against all gamma radiation. For nuclear medicine (I-131, PET), lead aprons provide limited benefit — distance and time are more important.

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Thyroid Collar & Lead Glasses

Thyroid Collar

Mandatory for fluoroscopy and cath lab work
Thyroid is highly radiosensitive (especially in young females)
Worn in addition to lead apron — not a substitute
0.5 mm Pb equivalent minimum

Lead Glasses

Indicated for staff performing regular fluoroscopy
Cataracts risk: ICRP now recognises no clear threshold — occupational lens dose limit 20 mSv/yr
Side shields recommended for full protection
Particularly important: cath lab nurses, IR nurses, orthopaedic theatre nurses

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Dosimetry Badge (TLD / OSL)

TLD = Thermoluminescent Dosimeter; OSL = Optically Stimulated Luminescence — both measure cumulative dose
Worn on collar level, outside the lead apron (represents head/neck dose)
Second badge may be worn at waist under apron to estimate effective dose
Reports sent quarterly — reviewed with department lead
Badge must be returned and new badge issued each quarter
Never leave badge in radiation area when not wearing it — will falsely elevate readings
Pregnant workers: additional abdominal badge at bump level worn under apron

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Occupational Dose Limits (ICRP)

Category	Annual Limit	Notes
Occupational (general)	20 mSv/yr	Averaged over 5 years (max 50 mSv in any single year)
Lens of eye	20 mSv/yr	Revised down from 150 mSv in ICRP 118 (2012)
Skin / extremities	500 mSv/yr	Averaged over 1 cm²
Public	1 mSv/yr	Effective dose limit
Declared pregnant worker	1 mSv total	For remainder of pregnancy after declaration

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Pregnancy & Radiation — Nursing Considerations

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Declared pregnant worker dose limit: 1 mSv for remainder of pregnancy — this is a legal requirement, not a recommendation.

Actions on Declaration

Notify line manager and Radiation Protection Officer (RPO) in writing
Reassign away from fluoroscopy, cath lab, nuclear medicine, and IR
Issue additional abdominal dosimetry badge
Document risk assessment in occupational health file
Review badge readings monthly (not quarterly) during pregnancy

Fetal Dose Risks — Context

Normal occupational exposureNo measurable fetal risk

Risk threshold for fetal harm>100 mGy (virtually never reached occupationally)

Malformation risk below 100 mGyNot demonstrably increased

Highest risk periodOrganogenesis: weeks 2–8

Annual occupational limit of 20 mSv equates to <1 mGy fetal dose with proper shielding — well below thresholds for deterministic harm.

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IV Contrast Media — Iodinated (CT)

Pre-procedure Checks

Allergy history: prior contrast reaction, shellfish allergy (weak predictor), iodine allergy
Renal function: eGFR — hold metformin if eGFR <60 (restart 48h post-contrast if stable)
Hydration: IV 0.9% NaCl pre- and post-contrast for renal protection if eGFR <45
Cannula: minimum 20G (18G preferred for high-flow CT); test flush before contrast
Consent: patient informed of contrast use and reaction risk
Premedication (if prior moderate/severe reaction): oral prednisolone 50mg at 13h, 7h, 1h pre; antihistamine

Contrast Reaction Management

Severity	Features	Action
Mild	Nausea, warmth/flushing, urticaria (<10 sites), single vomit	Observe 30 min; reassure; antihistamine if urticaria
Moderate	Extensive urticaria, wheeze (mild), facial oedema, palpitations	Stop contrast; O2; IV antihistamine + IV hydrocortisone; call radiologist
Severe	Anaphylaxis: hypotension, bronchospasm, LOC, laryngeal oedema	Adrenaline 0.5 mg IM (1:1000) — call MET/resus team immediately

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Delayed reactions can occur 30 min – 1 hour post-contrast. All patients must remain in department for minimum 30 minutes observation after IV iodinated contrast.

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MRI Safety — Nurse Role

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MRI safety screening is a nursing responsibility. Nurse-administered MRI safety questionnaire must be completed before every scan — no exceptions, including emergency MRI.

Ferromagnetic Hazards

Cardiac pacemakers and ICDs (check MRI conditional status)
Cochlear implants (most are MRI unsafe)
Ferromagnetic aneurysm clips
Metallic foreign bodies (especially orbital — X-ray screening required)
Bullets, shrapnel, metal fragments
Insulin pumps, neurostimulators
Prosthetic heart valves (most are MRI conditional)

MRI Device Categories

MRI SafeNo known hazards — e.g. titanium implants

MRI ConditionalSafe under specific conditions — verify field strength, SAR limits

MRI UnsafeDo not scan — most cochlear implants, some pacemakers, ferromagnetic clips

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IV Gadolinium (MRI Contrast)

Nephrogenic Systemic Fibrosis (NSF)

Rare but serious fibrosing condition linked to gadolinium in severe renal impairment
Risk: eGFR <30 mL/min/1.73m² — use only if essential, with radiologist approval
Group I agents (linear gadolinium) higher risk — Group II (macrocyclic) preferred
Document renal function before gadolinium administration
Haemodialysis patients: urgent HD post-gadolinium if required

Patient Preparation (CT/MRI)

Cannulation and test flush
Fasting: 4h solid / 2h clear fluids for IV contrast (contrast aspiration risk if vomiting)
Written consent if institutional policy requires
Critically ill: continuous monitoring throughout scan — nurse must accompany with MRI-safe equipment
Post-contrast: 30 min observation, encourage oral hydration

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Portable X-rays on the Ward — Nursing Role

During the Exposure

Position patient as requested by radiographer — leave the area
Step back minimum 2 metres from X-ray tube and patient during exposure (inverse square law — 2m = 1/4 dose vs 1m)
If clinical necessity requires you to remain close (e.g. holding an infant, confused patient): wear lead apron — request one from the radiographer
Ensure other ward patients and visitors are not in direct beam
Use ward lead screens if available during portable CXR series

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Inverse Square Law in Practice: At 1m, dose = 1 unit. At 2m = 1/4 unit. At 3m = 1/9 unit. Simply moving to the other side of the bay dramatically reduces scatter exposure.

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Scatter from a portable CXR is minimal — stepping 2m back and turning sideways is sufficient protection for incidental ward exposure.

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High-Dose Fluoroscopy Procedures

Highest Dose Procedures

Coronary angiography / PCI (cath lab)
TACE (transarterial chemoembolisation)
TIPS (transjugular intrahepatic portosystemic shunt)
Complex peripheral angioplasty
Neuroradiology interventions

Moderate Dose Procedures

GI fluoroscopy (barium studies)
Orthopaedic C-arm (fracture fixation)
Urology (stent insertion, PCNL)
Pain management (spinal injections)
Pacemaker / ICD implantation

Nurse Radiation Hygiene

Maximise distance from X-ray tube
Stand behind lead screen when possible
Step back during DSA (digital subtraction angiography) runs
Full PPE: apron + thyroid collar + lead glasses
Never lean into beam unnecessarily

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Dose Reduction Techniques — Operator

Collimation: reduce field size to area of interest — dramatically reduces scatter to patient and staff
Low-dose fluoroscopy modes: use pulsed fluoroscopy (e.g. 7.5 fps instead of 25 fps)
Last image hold: use static reference image rather than continuous fluoroscopy
C-arm angulation: 15-degree angle changes redistribute dose to different skin patches
Increase distance: detector close to patient, X-ray tube as far as possible
Avoid steep oblique angulations unnecessarily — increase scatter to staff and patient skin dose
Record and review: fluoroscopy time (minutes) and cumulative DAP (dose area product) documented for every procedure

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Fluoroscopy-Related Radiation Skin Injury

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Radiation skin injury is a rare but serious complication of prolonged fluoroscopy. Nurses must recognise delayed presentation and ensure documentation.

Dose / Threshold	Effect	Onset
~2 Gy	Erythema (transient)	Hours–days
~3–6 Gy	Epilation (hair loss)	2–3 weeks
~6–8 Gy	Moist desquamation	4–6 weeks
>12 Gy	Radionecrosis / ulceration	Weeks–months

Nursing actions: Document cumulative procedure dose in notes. Provide written patient information post-high-dose procedure. Follow up at 2–4 weeks if dose >3 Gy to skin entry point.

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Interventional Radiology — Nursing Recovery Role

Post-Procedure Recovery Priorities

Access site monitoring: Femoral / radial puncture site — check for haematoma, bleeding, pseudoaneurysm every 15 min for 1–2h
Neurovascular checks: Distal pulses, colour, warmth, sensation in limb post-arterial access
Bed rest: Femoral: 4–6h; Radial: early mobilisation with TR band in situ
Contrast monitoring: urine output, renal function as per protocol
Radiation dose documentation: Record cumulative dose/fluoroscopy time in nursing notes and inform patient if significant dose delivered (>3 Gy estimated skin dose)

Procedure-Specific Notes

TACE — Nursing Recovery ▼

Post-embolisation syndrome: fever, nausea, pain — expected; manage with analgesia + antiemetics
Monitor LFTs — hepatic ischaemia risk
Hydration: maintain urine output (contrast + ethanol/lipiodol nephrotoxicity risk)

TIPS — Nursing Recovery ▼

Hepatic encephalopathy risk post-TIPS — neuro obs, ammonia level
Monitor for shunt dysfunction: ascites recurrence, variceal re-bleeding
Contrast-induced nephropathy risk — hydration protocol

Coronary Angiography — Cath Lab Recovery ▼

Radial access: TR band pressure release protocol — titrate over 2–4h
ECG monitoring post-PCI for arrhythmia / stent thrombosis signs
Medication check: dual antiplatelet therapy initiated as per protocol

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Nuclear Medicine — Radioactive Patients

Nuclear medicine patients receive unsealed radioactive substances — they remain radioactive until the radiopharmaceutical decays or is excreted.

Investigation	Radiopharmaceutical	Half-life	Precautions
Bone scan	Tc-99m MDP	6h	Minimal — standard precautions; flush toilet x2
Lung V/Q scan	Tc-99m MAA	6h	Minimal precautions
PET-CT	F-18 FDG	110 min	Avoid prolonged close contact for 2–4h post-injection
Myocardial perfusion	Tc-99m sestamibi	6h	Flush toilet x2, 24h
I-131 therapy	I-131 sodium iodide	8 days	Full radiation precautions — see below

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I-131 Therapy — Nursing Precautions

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I-131 patients are radioactive for days to weeks. The primary exposure route to nurses is external gamma radiation and internal contamination from bodily fluids (urine, saliva, sweat).

Ward Precautions

Time: limit nursing contact to essential care only — coordinate multiple tasks in single visit
Distance: maintain >1m when not providing direct care
Lead apron: wear for direct care (limited benefit for gamma — but reduces dose during prolonged contact)
Bodily fluids: urine, saliva, vomit contain I-131 — double-glove, apron, eye protection; flush toilet twice
Linen: treat as radioactive waste — dedicated containers
Signage: radiation precaution signs on door; visitors restricted
Nurse to nurse handover: cumulative dose monitoring if same nurse cares for patient over multiple days

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I-131 Discharge Patient Education — Nurse Role

Contact Restrictions

Avoid prolonged close contact with children (<16 yr) and pregnant women for 2–3 weeks
Sleep in separate bed/room for 7–14 days
Keep >1m from others in public for first week
Avoid public transport if possible for first 3 days

Bodily Fluid Hygiene

Flush toilet twice after use for 2 weeks
Wash hands thoroughly
Use separate towels and utensils for first week
Double-bag used tissues / sanitary products
Breastfeeding: must stop before I-131 therapy

Return to Normal Activity

Return to work (office): 3–5 days post-therapy (dose-dependent)
Return to work (contact with children/pregnant): 2–4 weeks
Contraception: 6–12 months post-therapy (ARSAC guidance)
Provide written discharge instructions — verbal is insufficient

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External Beam Radiotherapy (EBRT)

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EBRT patients are NOT radioactive. There are no radiation protection precautions required for nursing staff or visitors during or after treatment. The beam is off between fractions.

Radiotherapy Side Effect Nursing

Acute Effects (during/weeks after RT)

Skin reactions: erythema → dry desquamation → moist desquamation
Mucositis (head & neck RT) — oral hygiene protocol
Fatigue — common; reassure, energy conservation
Nausea (abdominal RT) — antiemetics
Diarrhoea (pelvic RT) — dietary advice, loperamide

Late Effects (months–years post-RT)

Radiation fibrosis — lung, bowel
Lymphoedema (pelvic, axillary RT)
Secondary malignancy (rare)
Hypothyroidism (neck RT)
Cognitive effects (brain RT)

Skin Care During Radiotherapy

Avoid friction, sun exposure, tight clothing, and perfumed products in treatment field. Use prescribed aqueous cream or barrier cream. Pat dry — never rub.

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Brachytherapy — Sealed Sources

Brachytherapy involves placing radioactive sources within or adjacent to the tumour. Patient is radioactive while source is in situ.

LDR Brachytherapy (Low Dose Rate) ▼

Source: e.g. I-125 seeds (prostate), Cs-137 (gynaecological)
Duration: hours to days — patient nursed in lead-shielded room
Nursing precautions: time, distance, lead apron for extended contact
If source dislodges: do NOT touch with bare hands — use long forceps → lead pot
Contact RPO immediately if source is found outside patient

HDR Brachytherapy (High Dose Rate) ▼

Source: Ir-192 remote afterloading unit (very high activity)
Duration: minutes — patient is in shielded room during treatment
Staff and visitors LEAVE shielded room during treatment
Nurse enters room only after source has retracted into safe — confirmed by machine
Patient is NOT radioactive between fractions or after treatment

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Lost source emergency: Evacuate the room, contact RPO, restrict access. Never attempt to retrieve a brachytherapy source without specialist guidance.

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ALARA & Three Principles — Exam Format

Q: What does ALARA stand for and what is its significance?

A: As Low As Reasonably Achievable. Fundamental principle: every dose not strictly necessary must be avoided. Applies to patients AND staff.

Q: Name the 3 basic principles of radiation protection for staff.

A: (1) Time — minimise duration of exposure; (2) Distance — maximise distance (inverse square law); (3) Shielding — use lead aprons, screens, architectural shielding.

Q: If a nurse doubles their distance from an X-ray source, what happens to their dose?

A: Dose reduces to one quarter (inverse square law: dose ∝ 1/distance²).

Q: What is the difference between a Gray and a Sievert?

A: Gray (Gy) = absorbed dose (energy per kg). Sievert (Sv) = effective dose = absorbed dose × radiation weighting factor × tissue weighting factor. Sv reflects biological risk.

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Occupational Dose Limits — Exam Values

Q: What is the annual occupational dose limit for radiation workers?

A: 20 mSv/year averaged over any consecutive 5 years, with no single year exceeding 50 mSv (ICRP 103).

Q: What is the dose limit for members of the public?

A: 1 mSv/year effective dose.

Q: What is the dose limit for a declared pregnant worker?

A: 1 mSv to the abdomen for the remainder of the pregnancy after declaration.

Q: What is the annual dose limit for the lens of the eye?

A: 20 mSv/year (revised down from 150 mSv following ICRP Publication 118, due to cataract risk).

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Contrast Reaction Management — Quick Reference Table

Grade	Clinical Features	Immediate Management	Drug Treatment
Mild	Nausea, warmth/flushing, limited urticaria (<10 wheals), single episode of vomiting, rhinorrhoea	Observe 30 min; no IV access needed if not already in situ; reassure patient	Oral/IV antihistamine if urticaria troublesome. No steroids routinely needed.
Moderate	Extensive urticaria (>10 wheals), mild bronchospasm (wheeze), facial/laryngeal oedema (early), tachycardia, hyper/hypotension	Stop contrast infusion. O2 via mask. IV access. Call radiologist immediately. Lay flat.	IV chlorphenamine 10mg + IV hydrocortisone 200mg. Salbutamol inhaler for bronchospasm. Monitor SpO2.
Severe (Anaphylaxis)	Cardiovascular collapse (hypotension, tachycardia), loss of consciousness, severe bronchospasm, stridor (laryngeal oedema)	Call resuscitation team / MET. Lay flat, legs elevated. High-flow O2. Prepare for intubation.	Adrenaline 0.5 mg IM (1:1000) — anterolateral thigh. Repeat every 5 min if needed. IV fluids 500 mL–1L bolus. IV chlorphenamine + hydrocortisone after adrenaline.

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MRI Safety — High-Yield Exam Points

Q: What must be done before every MRI scan regardless of urgency?

A: Nurse-administered MRI safety questionnaire — check for ferromagnetic implants, pacemakers, cochlear implants, metallic foreign bodies. No exceptions.

Q: What is the difference between MRI Safe and MRI Conditional?

A: MRI Safe = no hazard in any MRI environment. MRI Conditional = safe only under specified conditions (specific field strength, SAR limits) — must verify manufacturer guidance for individual device.

Q: Which renal eGFR threshold requires caution before IV gadolinium?

A: eGFR <30 mL/min — risk of NSF. Use macrocyclic (Group II) agents only if essential. eGFR <15 (including dialysis) — only with radiologist authorisation.

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GCC Licensing Bodies — Radiation Questions

Q: Which UAE federal body regulates radiation sources?

A: FANR — Federal Authority for Nuclear Regulation. Licenses radioactive sources and radiation-producing equipment nationally.

Q: DHA and DOH — what do they govern regarding radiation?

A: DHA (Dubai) and DOH (Abu Dhabi) set emirate-level radiology department standards, staff dosimetry requirements, pregnant worker policies, and radiation protection manuals.

Q: SCFHS / QCHP — what radiation topics appear in nursing exams?

A: ALARA principle; occupational dose limits; TLD badge placement (collar, outside apron); lead apron storage (hanging); contrast reaction management (adrenaline dose); I-131 precautions; MRI safety screening responsibility.