Study the Noninterpretive Skills (NIS) and Radioisotope Safety (RISC) sections
of the diagnostic radiology Core and Certifying exams. A practicing diagnostic
radiologist built the app for focused, offline review.

Read cited lessons, answer board-style questions, and see your progress by
domain. The app works without an account or internet access and contains no ads.

Start free with an eight-question high-yield sampler and the first two sections
of each guide. A one-time $4.99 purchase unlocks the rest. There is no
subscription or charge for later content updates.

FREE TO START
• An eight-question high-yield sampler drawn from locked NIS and RISC topics,
with grading, explanations, and citations.
• RISC: radiation protection and the mathematics of radioactivity measurement.
• NIS: professionalism and the core concepts of quality and safety.
• Full lessons, essentials sheets, and practice questions for those four
sections, plus the readiness dashboard, search, and progress tracking.

FULL ACCESS: ONE $4.99 PURCHASE
• Every remaining section of both guides, with all of their lessons, essentials
sheets, and questions.
• The complete question bank across every practice pool.
• Every future content update, including revisions for later exam cycles.
• One purchase for full access.

WHAT'S INSIDE
• 458 board-style, single-best-answer questions: 204 RISC and 254 NIS.
• 37 cited lessons with high-yield callouts, dose tables, and source links.
• Four review depths: everything, high-yield, must-know, and essentials.
• Instant grading with a cited explanation for every answer choice.
• Essentials sheets with must-know facts, key tables, and figures for each domain.
• A readiness dashboard with a per-guide mastery score, a study streak, and a
next-up lesson from your weakest domain.

TOPICS COVERED
RISC: radiation protection, management of radioactive sources, radiopharma-
ceutical administration, regulatory exposure limits, radiation biology, accident/
incident response, and the math of radioactivity measurement.
NIS: imaging informatics, quality and safety, MR safety and contrast reactions,
professionalism, and reimbursement, regulatory, and legal considerations.

BUILT FOR FOCUS
• Study offline on the wards, in the reading room, or while traveling.
• No sign-up, email, ads, or tracking across apps or websites.
• Report a content problem from any question.

WHO IT'S FOR
Diagnostic radiology residents taking the Core exam and radiologists taking the
Certifying exam who want to review the NIS and RISC material.

IMPORTANT
This app is an independent study aid. It is not affiliated with, endorsed by, or
sponsored by the American Board of Radiology (ABR) or any certifying body. Content
is for educational use only and does not constitute medical advice. Always verify
clinical values against primary sources before acting on them.