UNCLASSIFIED UNCLASSIFIED UNCLASSIFIED UNCLASSIFIED 1. Radon — Deter mination RADON AND ITS SHORT-LIVED DAUGHTER PRODUCTS IN 2. Radon — Decay — THE ATMOSPHERE, by L. B. Lockhart, Jr., and Ro. Patterson, Jr. 20 pp. and figs. April 5, 1966. Meas. 3. Atmosphere — Radioactivity A set of experimental conditions hay been derived which opt- U.S. Naval Research Laboratory. Report 6374. THE EXTENT OF RADIOACTIVE EQUILIBRIUM BETWEEN 1. Radon — Determination RADON AND ITS SHORT-LIVED DAUGHTER PRODUCTSIN 2. Radon — Decay — THE ATMOSPHERE, byL. B. Lockhart, fr.,and R. L. Patterson, Jr. 20 pp. and figs. April 5, 1966. Meas. 3. Atmosphere — A set of experimental conditions has been derived which opti- Radioactivity mizes the accuracy with which the radoa content of be atmosphere 1 Lockhart, L.B., Jr. mizes the accuracy with which the radon content of the atmosphere [. Lockhart, L.B., Jr. and its apparent residence time there can be determined from LE. Patterson, R-L.., Jr. and its apparent residence time there can be determined from II. Patterson, R.L., Jr. measurement of the filterable gross 8 activity during two separate 10-minute periods following the end of a 20-minute collection period. retentivity (glass fiber filter) and counted for § activity through a eficiency for the 8 particles emitted by RaB and RaC. The radio of efficiency for the 8 particles emitted by RaB and RaC:. The ratio of measured counts during the 61-thiough-71-minute decay period to measured counts during the 61-through-71-minute decay period to 10-mil (70. mg/cm?) aluminum abserber on equipment of known UNCLASSIFIED 10-mil (70. mg/cm?) aluminum absorber on equipment of known (over) UNCLASSIFIED UNCLASSIFIED (over) UNCLASSIFIED U.S. Naval Research Laboratory. Report 6374. 1. Radon— THE EXTENT OF RADIOACTIVE EQUILIBRIUM BETWEEN RADON AND ITS SHORT-LIVED DAUGHTER PRODUCTS IN THE ATMOSPHERE, by L. B. Lockiart, Jr.,and R. b.. Patterson, Ji. 20 pp. and figs. April 5, 1966. U.S. Naval Research Laboratory. Report 6374. Determination THE EXTENT OF RADIOACTIVE EQUILIBRIUM BETWEEN Meas. THE ATMOSPHERE, byL.. B. Lockhart, fr., and R. 1. Patterson, Ji. 2. Radon— Decay — RADON AND ITS SHORT-LIVED DAUGHTER PRODUCTS IN 3. Atmosphere — Radioactivity 20) pp. and figs. April 5, 1966. A set of experimental conditions has been derived which optimizes the accuracy with which the radon content of the atmosphere I. Lockhart, b.B., Jr. and its apparent residence time there can be determined from It. Patterson, R.L., Ji. mizes the accuracy with which the radon content of the atmosphere and its apparent residence time there can be determined from measurement of the filterable gross 8 activin during two separate 10-minute periods following the end of a 20-minute collection period, The 20-minute collection is made on a filter of essentially 100% retentivity (glass fiber filter) and counted for B activity through a 10-mil (7G. mg/cm?) aluminum absorber on equipreent of known efficiency for the 8 particles emitted by RaB and Rat. The ratio of measured counts during the 61-through-71-minute decay period to UNCLASSIFIED POF The 20-minute collection is made on a filter of. essentially 100% retentivity (glass fiber filter) and counted for 8 activity through a SOONre mee ee The 20-minute collection is made on a filter of essentially 100% a 10-mnimute periods following the end of a 20-minute collection period eR incasurement of the filterable gross @ activicy during two separate (ower) RTs U.S. Naval Research Laboratory. Report 6374. THE EXTENT OF RADIOACTIVE EQUILIBRIUM BETWEEN _ Radon-— Determination . Radon — Decay ~ Meas. . Atmosphere ~ Radioactivity A set of experimental conditions has been derived which opu- measurement of the filterable gross 8 activity during two separate 10-minute perieds following the end of a 20-minute collection period. The 20-minute collection is niade on a hlter of essentially 100% retentivilty (glass fiber ilter) and counted tor 8 acuvity through a 10-mil (70. mg/cm?) aluminum absorber on equipment of known efficiency foi the B particles emitted by RaB and RaC. The ratio of measured counts during the 61-through-7]-minute decay period to poet Rome RET tS . Lockhart, LB, ji. 1. Patterson, R.L., Je.