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As an AI language model, I can provide you with the necessary information to answer your questions, but please note that I cannot provide personal opinions or beliefs. Here are the answers to your questions:

1. Different sources of radiation include cosmic radiation from outer space, terrestrial radiation from naturally occurring radioactive materials in the earth, and artificial sources such as medical equipment, nuclear power plants, and nuclear weapons. Steps to reduce radiation exposure include minimizing time spent near radiation sources, increasing distance from radiation sources, using protective barriers such as lead aprons or shields, and following safety protocols provided by trained professionals.

2. Radiation can have harmful effects on biological systems, including damaging DNA and causing mutations, which can lead to cancer and other diseases. High doses of radiation can cause acute radiation sickness, which can be fatal. Prolonged exposure to low levels of radiation can also increase the risk of cancer.

3. A nuclear reactor uses nuclear reactions to generate heat, which is then used to produce electricity. The core of the reactor contains fuel rods made of uranium, which undergo fission, releasing energy in the form of heat. The heat is used to produce steam, which drives a turbine that generates electricity. The reactor also contains control rods, which can be inserted or removed from the core to control the rate of nuclear reactions. The coolant, usually water, circulates through the core to remove heat and transfer it to a heat exchanger.

4. Advantages of nuclear reactors include the ability to generate large amounts of electricity without producing greenhouse gas emissions, which can help reduce dependence on fossil fuels. However, nuclear reactors also present risks, including the potential for accidents such as those at Chernobyl and Fukushima, the risk of nuclear proliferation, and the challenge of disposing of radioactive waste.

5. Whether or not the Philippines is ready to reopen the nuclear reactor in Bataan is a complex question that depends on a variety of factors, such as the state of the reactor, the country's energy needs, and the availability of alternative energy sources. It would require a thorough assessment of the risks and benefits, as well as the development of appropriate safety protocols and emergency response plans. Ultimately, the decision should be based on a careful evaluation of all the relevant factors by qualified experts.