Converter group
Radiology Converters
Radiation - Exposure Converter
Result
... Roentgen = ... Rep
Find the units to convert
Roentgen to Rep Converter
Use this page to convert roentgen values into rep, with background details, formulas, a worked example, and a quick conversion table.
Conversion formula
1 R = 1 rep
1 rep = 1 R
Example: 0.001 R = 0.001 rep
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Roentgen
Defined as the amount of radiation that produces one esu of charge in one cubic centimeter of dry air at STP.
History: Named after Wilhelm Röntgen, the discoverer of X-rays. Established in 1928.
Current use: Largely replaced by C/kg, but still found in older equipment and historical data.
Also written as R.
Rep
A legacy unit defined as the dose of any ionizing radiation that results in the absorption of 93 ergs per gram of tissue.
History: Introduced in the 1940s to extend the roentgen to radiations other than X-rays/gamma rays.
Current use: Obsolete, replaced by the rad and subsequently the gray.
Also written as rep.
Roentgen to Rep table
| Roentgen [R] | Rep [rep] |
|---|---|
| 0.01 R | 0.01 rep |
| 0.1 R | 0.1 rep |
| 1 R | 1 rep |
| 2 R | 2 rep |
| 5 R | 5 rep |
| 10 R | 10 rep |
| 20 R | 20 rep |
| 50 R | 50 rep |
| 100 R | 100 rep |
Frequently asked questions
How many Rep (rep) are in one Roentgen (R)?
One Roentgen equals 1 Rep.
How do you convert Roentgen to Rep?
Multiply the Roentgen value by 1 to get the result in Rep.
How do you convert Rep back to Roentgen?
Multiply the Rep value by 1 to get back to Roentgen.
What is 0.001 Roentgen in Rep?
0.001 Roentgen equals 0.001 Rep.