The Radioisotope Safety Content (RISC) domain covers defined imaging-safety topics. The official ABR RISC blueprint identifies eight areas and 35 questions in total: 25 in the Qualifying (Core) exam and 10 in Certifying Essentials. This page summarizes those areas without reproducing ABR questions or answer keys.
Use the current ABR blueprint as the authority for scope and administration. RadCore practice is supplementary study material, not an ABR product or a prediction of exam content.
What RISC Covers on the ABR CORE Exam
The official ABR RISC Domain blueprint identifies eight areas. The 35-question RISC allocation is split between 25 questions in the Qualifying (Core) exam and 10 in Certifying Essentials. The areas are:
**Radiation physics and biology** covers principles needed to reason about radiation and biological effects.
**Radiation protection and dose** covers safe practice for patients, staff, and the public.
**Radiopharmaceuticals and nuclear medicine safety** covers safe handling and use of radioactive materials.
**Contrast media safety** covers adverse events, risk assessment, and response principles; consult current clinical guidance for protocols.
**MRI safety** covers the safety environment, screening, implants, and incidents.
**Ultrasound safety** covers output and safe-use principles.
**Imaging equipment and quality assurance** covers safe operation and quality processes.
**Communication and patient safety** covers safety-critical information and related professional responsibilities.
These are blueprint areas, not a claim that every administration gives equal weight to each area. RISC should not be treated as a general imaging quality-control or communication examination.
RISC Topics to Prioritize
When study time is limited, use the ABR blueprint to cover all eight RISC areas and use your own practice results to choose what to revisit.
Why RISC Catches Residents Off Guard
RISC includes technical and safety concepts that benefit from deliberate review:
**The content includes numerical knowledge.** RISC study can include dose limits, contrast dosing thresholds, eGFR cutoffs, and SAR limits. Check values against current authoritative guidance rather than relying on memorized third-party summaries.
**Clinical exposure is uneven.** Clinical experience may not cover the underlying pharmacology, MRI zone model, or QC concepts in depth. Pair clinical exposure with systematic review and authoritative references.
**The radiation physics questions require a different cognitive mode.** Converting between dose units, applying tissue weighting factors, and calculating effective dose from absorbed dose are math-adjacent tasks that feel unfamiliar to residents who haven't done them since medical school physics.
**Communication deserves intentional review.** Include critical-results protocols and communication parameters in your coverage of the RISC blueprint rather than assuming any topic is absent or frequent.
How to Study RISC Effectively
A structured RISC study approach should address both the factual recall requirements and the application-level scenarios.
**Create a fact sheet for numerical thresholds.** Write out the key numerical values — dose limits, eGFR thresholds, contrast pre-medication protocols, MRI SAR limits — and review them regularly. These are the facts most likely to be tested directly and most easily forgotten without reinforcement.
**Work through RISC questions by category.** Don't mix RISC topics indiscriminately. Study radiation safety questions as a focused block, then contrast reactions, then MRI safety, then QC. Category-based studying builds a mental schema for each topic area that random-order practice doesn't.
**Trace your errors to their source.** When you miss a RISC question, determine whether the error was a knowledge gap (you didn't know the fact) or a reasoning error (you knew the facts but applied them incorrectly). These require different remediation strategies.
**Use the ACR Manual on Contrast Media and ACR Practice Parameters as references.** These are the primary sources for contrast agent guidelines and communication standards on the CORE exam. RadCore explanations reference these documents explicitly so you know exactly where the authoritative guidance comes from.
RadCore's RISC Question Bank: 270+ Questions Covering Every ABR Category
RadCore's RISC module contains 270+ independent practice questions organized around the eight RISC blueprint areas. Questions include explanations for study and should be checked against current official guidance.
Performance analytics show your accuracy broken down by RISC subcategory — radiation safety, contrast agents, MRI safety, quality control, and communication. This lets you identify exactly where your preparation is strongest and where you need more work, rather than relying on a single overall RISC score.
The custom set builder allows you to create targeted RISC practice sessions focused exclusively on your weakest categories — ideal for the final weeks before your exam when efficiency matters most.