Alternative sources of data include:
- DDEP (Decay Data Evaluation Project) hosted by LNHB (France): http://www.lnhb.fr/home/nuclear-data/nu ... ata-table/ - as these tables are specifically for experimental decay data, they're considered one of the best and most accurate sources, although can be limited to relatively common nuclides; they often don't have some of the weirder activation products I encounter.
- Nudat3 https://www.nndc.bnl.gov/nudat3/ - initial interface can seem a bit cluttered with graphs you're not interested in, but search your nuclide, and click through to decay radiation, and you get the nuclear data sheet with all types of radiation. Sometimes you have to be a bit careful to look under the right section for the relevant transition - the first section can often be another excited state that you're not looking for, but all the data is there, and sorted by intensity :)
- IAEA Nuclide Browser mobile app - https://play.google.com/store/apps/deta ... s.nuclides - same data as nudat3 but handy on your phone with a decent expert search feature I use a lot to help identify more unusual gamma lines
- IAEA Livechart - https://www-nds.iaea.org/relnsd/vcharth ... tHTML.html - same data, but with a nice web interface
- OECD NEA JANIS - https://www.oecd-nea.org/jcms/pl_39910/janis - Java program with all types of data from several different nuclear data libraries and a nice interactive Segre chart of nuclides
- JANIS Web https://www.oecd-nea.org/janisweb/ - as above but with a web based interface that I've never quite worked my way around properly but can be occasionally useful when accessing from a machine without the Java environment
