transported to Buffalo for assembly studies. Even though the tubes will not be available, tne scaffold will be used to obtain a true picture of space requirement. | Design of tne hotespot and case-motion camera shelter (Sta. 300) on Bogallua has been completed, approved, and construction started. PROGRAM 4 NEUTRON MEASUREMENTS Tne neutron measurement studies .conducted during Operation TumblerSnapper proved very satisfactory. It is planned to proceed with the new electronics system designed for these tests. Some additional labe oratory development will be necessary because of the non-limearity experienced in the extremely nign flux regions. Tne detectors provided good data upon analysis at tne Los Alamos Scientific Laboratory. The detectors planned for Ivy were field-tested at tne Tumbler-Snapper Operation. Considerable design work and testing were carried out on a device intended to permit recovery of neutron samples by means of a helicopter. Tae design utilized the blast for removal of a copper plate which permitted a spring-loaded pick-up hoop, attached to the samples, to move into view for recovery by the helicopter crew. Preliminary models were tested at Nevada for blast and thermal effects in regions of extreme conditions. As a result of these tests it was found that the blast effects are too severe, especially close to zero where the helicopter scheme would prove advantageous. It would be difficult to develop the necessary structures so that they would remain properly oriented and still maintain reasonable over-all costs for the program. It is now - 28 - LF