Zoonotic diseases

Zoonotic diseases are diseases that transmit from animals to humans and vice versa. Viruses and bacteria play a significant role in transmission. The symptoms and signs of zoonotic diseases caused by parasites can vary depending on the parasite and the individual involved.
Rabies, which are transmitted by bites from dogs, foxes, bats, and cats, is one of the most serious zoonotic diseases. Rift valley fever is spread by close contact with infected animals such as horses, goats, and sheep, as well as mosquito bites. Anthrax is a zoonotic disease spread by eating contaminated meat or getting into contact with infected cattle or wild animals. Dogs and cats especially when young are infected with worms like hookworms and ringworms which can be transmitted to human beings through contamination.
Ionizing Radiation.
Naturally occurring radioactive materials continuously emit ionizing radiation. The first primary source of natural ionizing radiation is radon, which produces the highest amount of natural ionizing radiation. Inside human body is another source through the food ingestion chain. Also, we have terrestrial sources which include radioactive materials that are found in rocks and soil. Lastly, we have cosmic radiation which happens as the earth moves through space.
The advantages of using ionizing radiation include its medical imaging to produce images of human internal structures, non- destructive testing to evaluate properties and components of materials and systems, industrial application in manufacturing and nuclear fuels to generate electricity which does not emit carbon gas thus reduction in global warming effects. Despite its benefits, ionizing radiations have disadvantages which include causing diseases like cancer. Also, poor storage materials or radiation accidents can lead to detrimental effects whose effects can be felt for even thousands of years. There is also the proliferation of nuclear weapons tests sparking global fears.

References
Feinendegen, L. E. (2014). Evidence for beneficial low level radiation effects and radiation
hormesis. The British journal of radiology.
United Nations Scientific Committee on the Effects of Atomic Radiation. (1996). Sources and
Effects of ionizing radiation. UNSCEAR 1996 report to the General Assembly, with scientific annex.