title: [Measurement and evaluation of radiation dose distribution of gamma-ray altimeter in static test for recovery capsule during simulated landing].
abstract: The gamma-ray altimeter, containing a gamma-radioactive source 137Cs with activity of 2.96 x 10(10) Bq, was used to detect the height of the spacecraft recovery capsule during landing. To measure the gamma-dose distribution near to the guidance section, especially at position where the useful load is located in recovery capsule, gamma-dose field at the test-site for one machine test was measured by means of a gamma-dose rate meter FJ-317C and a gamma-dose meter ANRI-01-02. The result showed that the absorbed dose rate at 5 meters from gamma-source on the ground is as low as the radiation protection limit when the altimeter is down to 0.16 m from the ground. The ground reflection effect for gamma-ray decreases as height of the recovery capsule increases. Therefore, the gamma-dose level at useful load in the recovery capsule will meet the requirements of flight safety.
authors.affiliation: Institute of Atomic Energy, Beijing.
authors.forename: J
authors.initials: J
authors.lastname: Song
authors.forename: Y
authors.initials: Y
authors.lastname: Shi
authors.forename: S
authors.initials: S
authors.lastname: Lin
authors.forename: S
authors.initials: S
authors.lastname: Dong
authors.forename: Z
authors.initials: Z
authors.lastname: Zhang
authors.forename: Z
authors.initials: Z
authors.lastname: Shen
mesh_terms: D000531:Altitude; D002588:Cesium Radioisotopes; D005720:Gamma Rays; D011829:Radiation Dosage; D011835:Radiation Protection / Q000592:standards*; D011874:Radiometry; D013026:Space Flight / Q000592:standards; D018531:Spacecraft
chemical_list: D002588:Cesium Radioisotopes