Where does polonium comes from

These countries include Andorra, Angola, Anguilla, Armenia, Azerbaijan, Bolivia, Bulgaria, Bhutan, Bahrain, Botswana, Bangladesh, Belarus, Bosnia and Herzegovina, Burundi, Bahamas, Brunei, Burkina Faso, Cuba, Comoros, Cameroon, Chad, China, Curacao, Cambodia, Cape Verde, Dominican Republic, Djibouti, Egypt, Equatorial Eswatini, Eritrea, Ethiopia, El Salvador, Jordan, Japan, Finland, France, Fiji, Guatemala, Guinea, Grenada, Guinea-Bissau, Greenland, Haiti, Honduras, Hong Kong, Hungary, Indonesia, Iran, Iraq, Ivory Coast, Kenya, Kuwait, Kyrgyzstan, Kiribati, Kazakhstan,Latvia, Liechtenstein, Liberia, Libya, Laos, Lesotho, Malaysia, Mali, Mauritius, Moldova, Monaco, Myanmar, Mozambique, Madagascar, Marshall Islands, Maldives, Montenegro, Macau, Iceland, Micronesia, Mongolia, Mauritania, Nicaragua, Namibia, Nepal, Niger, Nigeria, Oman, Papua New Guinea, Palau, Pakistan, Qatar, Russia, Romania, San Marino, Sao Tome and Principe, South Sudan, Serbia, Saudi Arabia, Sierra Leone, Senegal, Singapore, Slovakia, Somalia, Sudan, Suriname, Syria, Seychelles, Samoa, Uganda, Uzbekistan, Turkmenistan, Tajikistan, Tanzania, Taiwan, The Central African Republic, The Philippines, The Republic of Benin, the Republic of the Congo, Solomon Islands, The United Arab Emirates, Togo, Tunisia, Tuvalu, Tonga, Venezuela, Vietnam, Vatican City, and Yemen

Skin flakes, dog dander, bark fragments, and clothing fiber are also present
:( so strange, but I guess if things are electrical, anything is possible