<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31301260</termId><termName>radioactivity</termName><termType>PT</termType><termNote><![CDATA[ The phenomenon, exhibited by and being a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element. ]]></termNote><termCreatedDate>2026-03-30 20:20:56</termCreatedDate><relation><relationType>UF</relationType><termId>31301261</termId><termName>radioactive</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31298100</termId><termName>chemical properties</termName><termType>PT</termType></relation></term>  </Zthes>