Solar urticaria has nothing to do with ionizing radiation. as per the CDC, UVA is not ionizing. You can review this on cdc.gov, and maybe inform them they are wrong? A discovery that ionizing radiation is the causative factor of anaphylaxis in solar urticaria would probably get you quite a few awards. Looking forward to your contributions to health sciences.
It also doesn't matter, as the same occurs with infrared: google "heat urticaria". def not ionizing? You can use this link www.google.com to confirm, and also this one maybe: pubmed.ncbi.nlm.nih.gov
maybe also google "cold urticaria"? is negative (inverse?) infrared ionizing? Pressure urticaria is also cool, no radiation required at all.
Given the subject matter at hand is quite involved and requires fairly up to date expertise in neurology, allergy and immunology, oncology and dermatology to be able to evaluate mechanisms at hand, I have prepared for you a decent list of peer reviewed materials to begin your preparation:
a) ISBN: 0-87893-106-6
b) ISBN: 9780123851574
c) ISBN: 9780199558322
d) ISBN: 978-1-62618-166-3
e) ISBN: 978-92-4-157238-5
f) ISBN: 3034808372
g) ISBN: 9783034808378
h) ISBN: 978-92-76-29839-7
Once you have covered the basics in the above peer reviewed literature, most of which is even approved for training, you will then have no difficulty at all accepting the following:
1) Mast cells are located at the junction point of the host and external environment.
2) EMF penetrates into the skin tissue by several millimiters.
3) There is voluminous clinical evidence of mast cell degranulation by non-ionizing radiation
4) Mast cells produce inflammation, both local AND systemic.
5) Chronic inflammation causes DNA damage and increases risks of cancer and many other diseases.
Clinical implications of the interplay between EMF and mast cells is an ongoing area of research. There is like less than 90 papers published on this specific topic, which is miniscule. However, you should not review those papers until after you completed with basics.
Looking forward to your contributions.