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Read the digital handbook with correction notes, work through practice questions, and check your understanding with timed tests. Whether you’re preparing for your first exam or coming back for requalification, we’re here to help you study.

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480Practice questions
327Worked solutions
79/137Objectives covered
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Read all 13 modules of the DOE RCT Core handbook on your phone or computer. Page links help you find the material you need, and correction notes explain identified errors in the printed text. Review and corrections are ongoing.

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Use study sessions to work through questions, then take a timed practice test. Review your answers and use your progress to decide what to study next.

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Review your answers

Understand where you went wrong

Feedback explains why an answer is incorrect, whether you used the wrong constant, missed a step or mixed up your units.

Worked solutions take you through the calculation step by step, with a handbook reference so you can return to the topic and review it.

You can also follow the key sequence for your calculator as you practice.

1.11.02 · External Exposure ControlRCT-NSHNY
A 2 Ci Na-24 calibration source is set up on a stand. What is the approximate exposure rate at 3 metres?
a5.497 R/hrYOUR PICK
d0.4581 R/hrCORRECT
Incorrect — the answer is d) 0.4581 R/hr
Wrong unit-system constantThe constant for the other unit system was used. Use 6 for feet and 0.5 for metres.
I1m = 0.5CENthe rule of thumb
Σ EN = 4.123 MeVsum of energy × yield for every photon
I1m = (0.5)(2)(4.123) = 4.123 R/hrsubstitute
I2 = (4.123)(1)² / (3)²point source, so inverse square
0.4581 R/hr
Sum energy × yield — Na-24 emits 2 gammas. → 4.123
Use the metre-based estimate — 6CEN gives the rate at one foot; 0.5CEN gives it at one metre. → 4.123
Correct for distance — Point source, so inverse square applies. → 0.4581 R/hr
DOE-HDBK-1122-2009Module 1.11
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Sources

Go back to the source

Handbook citations help you connect a practice question to the material you’re studying. These are the main references behind the exam topics.

DOE-HDBK-1122
The RCT training handbook. Use the module and page references in worked solutions to review the source material.
DOE-STD-1098
The DOE Radiological Control standard, covering topics such as posting, limits and radiological controls.
10 CFR 835
Occupational Radiation Protection requirements, including dose limits and monitoring.