In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.
Q: Question: How high is the gamma radiation from nuclear fuel? Passage 1:On November 9, 2010, Hacker signed with the Minnesota Twins. He attended spring training but was sent to the minors after posting a 13.50 ERA in five games. He was called up to Minnesota on April 19 to replace Alex Burnett (who was optioned) in the bullpen; Twins manager Ron Gardenhire said, "We need a long guy [in the bullpen]." He made his Twins' debut that day, throwing two scoreless innings in an 11–0 loss to the Baltimore Orioles. In his next game on April 27, he gave up one unearned run in innings but allowed three inherited runners to score in an 8–2 loss to the Tampa Bay Rays. After the game, Hacker was optioned back to Triple-A Rochester to make room on the roster for Anthony Swarzak. On July 17, he was outrighted off the 40-man roster to make room for Scott Diamond. With the Rochester Red Wings of the International League, Hacker had a 7–14 record, a 6.10 ERA, 98 strikeouts, 50 walks, and innings pitched in 26 games (25 starts). He tied with Diamond for the league lead in losses, ranked sixth in the league in walks, led the league in runs allowed (103), and ranked third in the league in earned runs allowed (92, behind Thad Weber's 95 and Corey Kluber's 93). On October 4, he became a free agent.
 Passage 2:The nuclear fuel elements were made of refractory ceramic based on beryllium oxide, with enriched uranium dioxide as fuel and small amount of zirconium dioxide for structural stability. The fuel elements were hollow hexagonal tubes about long with distance between the outer parallel planes, with inside diameter of . They were manufactured by high-pressure extruding of the green compact, then sintering almost to its theoretical density. The core consisted of 465,000 individual elements stacked to form 27,000 airflow channels; the design with small unattached elements reduced problems related with thermal stresses. The elements were designed for average operation temperature of ; the autoignition temperature of the reactor base plates was only 150 °C higher. The neutron flux was calculated to be 9×10 neutrons/(cm·s) in the aft and 7×10 neutrons/(cm·s) in the nose. The gamma radiation level was fairly high due to the lack of shielding; radiation hardening for the guidance electronics had to be designed.
 Passage 3:After his term as consul, Didius was assigned to govern the province of Hispania Citerior, where he served from 97 BC to 93 BC. Nearly his entire proconsular term in Spain was spent at war with the Celtiberi. In the four years Didius governed Spain he achieved multiple victories and is said to have slain 20,000 Arevaci, quelled the rebellious city of Termes (today Tiermes in the province of Soria), and besieged Colenda for nine months, after which time the city fell and the women and children were sold into slavery. Didius earned another triumph after slaughtering a colony of "robbers" -- in actuality, poor people who had banded together to subsist through banditry after losing their property. Didius lured them in with promises of land to live on, and when the families assembled within the Roman castra in good faith, he had them all killed. The historian Appian indicates that Didius's exceptional cruelty and treachery caused an even greater uprising which his experienced successor, C. Valerius Flaccus, had to put down.

A:
2