Converter group
Radiology Converters
Radiation - Exposure Converter
Result
... Roentgen = ... Parker
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Roentgen to Parker Converter
Use this page to convert roentgen values into parker, with background details, formulas, a worked example, and a quick conversion table.
Conversion formula
1 R = 1 parker
1 parker = 1 R
Example: 0.001 R = 0.001 parker
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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.
Parker
Equivalent to the roentgen in most contexts.
History: Named after Herbert Parker, a pioneer in health physics.
Current use: Obsolete, used only in historical radiation safety texts.
Also written as parker.
Roentgen to Parker table
| Roentgen [R] | Parker [parker] |
|---|---|
| 0.01 R | 0.01 parker |
| 0.1 R | 0.1 parker |
| 1 R | 1 parker |
| 2 R | 2 parker |
| 5 R | 5 parker |
| 10 R | 10 parker |
| 20 R | 20 parker |
| 50 R | 50 parker |
| 100 R | 100 parker |
Frequently asked questions
How many Parker (parker) are in one Roentgen (R)?
One Roentgen equals 1 Parker.
How do you convert Roentgen to Parker?
Multiply the Roentgen value by 1 to get the result in Parker.
How do you convert Parker back to Roentgen?
Multiply the Parker value by 1 to get back to Roentgen.
What is 0.001 Roentgen in Parker?
0.001 Roentgen equals 0.001 Parker.