## double escape peak

https://doi.org/10.1351/goldbook.D01843
In a gamma-ray spectrum, the peak due to @[email protected] in the detector and escape, from the sensitive part of the detector, of two @[email protected] of $$511\ \text{keV}$$ resulting from @[email protected]
Source:
PAC, 1982, 54, 1533. (Glossary of terms used in nuclear analytical chemistry (Provisional)) on page 1541 [Terms] [Paper]