The most radioactive place in the universe is difficult to determine definitively as it depends on various factors such as the type of radiation and the specific sources present. However, there are several astrophysical phenomena and locations that are known to have extremely high levels of radiation.
One example is the immediate vicinity of a black hole. Black holes are incredibly dense objects with strong gravitational forces. When matter falls into a black hole, it can form an accretion disk, where particles are heated and accelerated to high energies, emitting intense radiation including X-rays and gamma rays. These regions close to black holes can exhibit extremely high radiation levels.
Another example is supernovae, which are powerful explosions that occur at the end of a massive star's life. During a supernova event, a tremendous amount of energy is released, and various types of radiation, including gamma rays, are produced. The immediate vicinity of a supernova can be highly radioactive.
Regarding calculating radiation levels in sieverts per hour (Sv/h), it is important to note that sieverts are typically used to measure the biological effects of radiation on living organisms. However, in extreme astrophysical environments, such as those mentioned above, the radiation levels are often so intense that traditional human-centric measurement scales may not be applicable.
In astrophysics, different units and measurement methods are used to describe radiation intensity. For example, the flux of photons or particles per unit time and unit area may be used. Additionally, the energy spectrum of the radiation and the distance from the source are important considerations.
Given these complexities and the lack of direct applicability of sieverts per hour to extreme astrophysical environments, it may not be feasible or meaningful to calculate radiation levels in sieverts per hour for such locations. Instead, astronomers and astrophysicists utilize specialized techniques and units suited for characterizing radiation in space, taking into account the specific context and properties of the radiation sources.