Answer:
checking the dosage of gamma radiation that the victim was exposed to.
Explanation:
Acute Radiation Syndrome (ARS) is a full body illness caused by exposure to radiation, usually it only takes a high dose of radiation a couple of seconds or minutes to affect a person with this illness. According to my research on ARS, I can say that based on the information provided within the question the most important factor would be checking the dosage of gamma radiation that the victim was exposed to.
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