Dr Paul Brown - Resonant Nuclear Battery Demonstration 1987

In late 1980s, Dr. Paul M. Brown patented a resonant nuclear battery, and successfully demonstrated a 75 watts prototype. It used a 2 millimeters long Strontium-90 needle to produce that much electricity as compared to NASA's Plutonium based RTGs which produces 0.54 watts per gram.

Apparatus for direct conversion of radioactive decay energy to electrical energy:
https://patents.google.com/patent/US4835433

Alpha-Beta Voltaic Effect – NuCell Resonant Nuclear Battery:
http://www.rexresearch.com/nucell/nucell.htm

The Half-Life of a Nuclear Battery – Amazon:
https://tinyurl.com/2zsnp4zk

Dr. Brown attempted to communicate with John Searl in the 1980s. He wrote 13 letters to John Searl because Paul Brown said he had built his own SEG unit called the DPU (Demonstration Power Unit) using a strontium90/neodymium alloy.
Here is one letter: https://drive.google.com/drive/folders/1G0cmXS8GAXM-W4SwCU6-VjulfIkdzETN