NBS Handbook, Tema 42U.S. Government Printing Office, 1949 |
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Página 6
... thickness is taken as 7 mg / cm2 . For the palm of the hand the thickness is greater and a value of 40 mg / cm2 is often used . 4. Earlier practice in the handling of radium and related compounds condoned the acceptance of greater ...
... thickness is taken as 7 mg / cm2 . For the palm of the hand the thickness is greater and a value of 40 mg / cm2 is often used . 4. Earlier practice in the handling of radium and related compounds condoned the acceptance of greater ...
Página 12
... thickness . A " diaper " paper is available that has a waterproof backing to reduce pene- tration of spills to the work surface . 8 This subject will be covered more extensively in the report of the Sub- committee on Waste Disposal and ...
... thickness . A " diaper " paper is available that has a waterproof backing to reduce pene- tration of spills to the work surface . 8 This subject will be covered more extensively in the report of the Sub- committee on Waste Disposal and ...
Página 22
... the regulations prescribed for the shipment of isotopes outside the laboratory ( see appendices 2 and 3 ) . THICKNESS ( T ) OF ABSORBER - MM 4 0 22 III 1 1 1 Transportation Shipment of isotopes Movements in the laboratory.
... the regulations prescribed for the shipment of isotopes outside the laboratory ( see appendices 2 and 3 ) . THICKNESS ( T ) OF ABSORBER - MM 4 0 22 III 1 1 1 Transportation Shipment of isotopes Movements in the laboratory.
Página 23
... Thickness The table given below may be used to determine the re- quired thicknesses for shielding from gamma - ray sources in the laboratory . Select column for energy required ( use next higher if exact value is not given ) . Entry ...
... Thickness The table given below may be used to determine the re- quired thicknesses for shielding from gamma - ray sources in the laboratory . Select column for energy required ( use next higher if exact value is not given ) . Entry ...
Página 24
... thickness = ( 8.60 + 2.77-1.39 ) X 1.43 14.3 cm of Fe , in which ( a ) ( b ) ( c ) a = basic entry . ( d ) b = correction for danger range = 50 cm . c = correction for 4 hr / day . d = conversion from Pb to Fe . ENERGY ( Mev ) Activity ...
... thickness = ( 8.60 + 2.77-1.39 ) X 1.43 14.3 cm of Fe , in which ( a ) ( b ) ( c ) a = basic entry . ( d ) b = correction for danger range = 50 cm . c = correction for 4 hr / day . d = conversion from Pb to Fe . ENERGY ( Mev ) Activity ...
Otras ediciones - Ver todas
National Bureau of Standards Handbook, Volumen2;Volumen13;Volumen77 Sherman F. Booth Vista completa - 1961 |
Términos y frases comunes
absorbent absorption active materials active solutions Alloy studies beta radiation Beta-Gamma beta-ray blood count body Bone Bureau of Explosives Bureau of Standards chairman Chem chemistry Committee conditions normally incident corpuscular CURIE decontamination deposition disintegrations dose dust effective electrically charged elimination equipment FAILLA Feces film badges fission products gamma radiation gamma rays filtered Geiger counter half-life Handling of Radioactive hands hazard hr/day inch of lead incident to transportation ingestion inhalation inspection instrument Interstate Commerce Commission ion chamber irradiation laboratory Liver lungs MDDC ment metabolism millicurie milliroentgens monitoring mr/hr National Bureau Neutron Radiation Nucleonics organizations package packed particles permissible personnel pocket chambers polonium r/hr radiation protection radioactive contamination radioactive isotopes radioactive materials radioactive substances radioisotopes Radiological radiotoxicity radium gamma rays range shielding SHIPMENT OF RADIOACTIVE shipping container significant alpha sorbed specifically strontium Subcommittee suitable inside containers surface contamination survey meter tests thickness tion Urine waste disposal X-ray Zeuto
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Página 26 - Radioactive materials that present special hazards due to their tendency to remain fixed In the human body for long periods of time (ie, radium, Plutonium, and radioactive strontium, etc.) must, in addition to the packing...
Página 28 - The inside containers must be surrounded on all sides by an absorbent material sufficient to absorb the entire liquid contents and of such nature that its efficiency will not be impaired by chemical reaction with the contents.
Página 28 - ... 0.1 millicuries of radium, or polonium, or that amount of strontium 89, strontium 90, or barium 140 which disintegrates at a rate of more than 5 million atoms per second; or that amount of any other radioactive substance which disintegrates at a rate of more than 50 million atoms per second.
Página 26 - All outside shipping containers must be of such design that the gamma radiation will not exceed 200 mr/hr or equivalent at any point of readily accessible surface. Containers must be equipped with handles and protective devices when necessary in order to satisfy this requirement...
Página 6 - In the absence of an internationally accepted unit, the "rep" is a convenient shorthand notation for statements of dose of ionizing radiation not covered by the definition of the roentgen. It represents that dose which produces energy absorption of 93 ergs/gram of tissue.
Página 26 - ... from any point on the radioactive source will not exceed 10 milliroentgens per hour. The shield must be so designed that it will not open or break under conditions incident to transportation. The minimum shielding must be sufficient to prevent the escape of any primary corpuscular radiation...
Página iii - At a meeting of this committee in December 1946, the representatives of the various participating organizations agreed that the problems in radiation protection had become so manifold that the committee should enlarge its scope and membership and should appropriately change its title to be more inclusive. Accordingly, at that time the name of the committee was changed to the National Committee on Radiation Protection. At the same time, the number of participating organizations was increased and the...
Página 26 - ... be packed in suitable inside containers completely surrounded by a shield of lead or other suitable material of such thickness that at any time during transportation the gamma radiation at one meter (39.3 inches) from any point on the radioactive source will not .exceed 10 milliroentgens per hour.
Página 9 - ... the feces may be required when the predominant elimination is by feces. Special tests for specific isotopes are in order when they exist (eg, radioiodine may be estimated in the thyroid gland in terms of the emitted gamma radiation measured by a Geiger counter or ionization chamber). Where exposure 4 A single exposure of 25 r can apparently escape detection by standard blood counting techniques.
Página iii - In order to distribute the work load, eight working subcommittees were established as noted below. Each of these committees is charged with the responsibility of preparing protection recommendations in its particular field. The reports of the subcommittees are approved by the main committee before promulgation. The following parent organizations and individuals comprise the main committee : HL ANDREWS, United States Public Health Service. EG WILLIAMS, MD, United States Public Health Service. SHIELDS...