Question 1: A British ________ was purposely left behind to indicate that this was the work of British forces and not of the local resistance, in order to alleviate reprisals.
Question 3: The Norwegian Grouse team thereafter had a long arduous wait in their mountain hideaway, subsisting on moss and lichen during the winter until, just before ________, a reindeer was encountered.
Question 5: During World War II, the Allies decided to remove the heavy water supply and destroy the heavy water plant in order to inhibit the ________ development of nuclear weapons.
Question 6: In nuclear weapon development, the main problem is securing sufficient "weapons grade" material, in particular the fissile ________ of either uranium-235 (235U) or 239Pu.
Question 7: In Operation Grouse, the British ________ (SOE) successfully placed four Norwegian nationals as an advance team in the region of the Hardanger Plateau above the plant.
Question 8: Between 1940 and 1944 a sequence of sabotage actions, by the ________, as well as Allied bombing, ensured the destruction of the plant and the loss of the heavy water produced.
Question 9: ________ occurs in very low concentrations (1 part in 6,000) in normal water but is more concentrated in the residue of water used as an electrolyte.
Question 10: Although the most common isotope of uranium, ________ (238U), cannot be used as the primary fissile material for an atomic bomb (it can be used as secondary fissile material in hydrogen bombs), 238U can be used to produce 239Pu.