NBS Handbook, Tema 42U.S. Government Printing Office, 1949 |
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Página 6
... measured in air ( i . e . , without back- scatter ) . According to present knowledge , this general ex- posure to gamma radiation is believed to be safe as far as any bodily injury is concerned , when there is no other type of radiation ...
... measured in air ( i . e . , without back- scatter ) . According to present knowledge , this general ex- posure to gamma radiation is believed to be safe as far as any bodily injury is concerned , when there is no other type of radiation ...
Página 9
... measured , or when the pos- sible exposure is restricted to one isotope , this should be chemically separated from the urine . Examination of the feces may be required when the predominant elimination is by feces . Special tests for ...
... measured , or when the pos- sible exposure is restricted to one isotope , this should be chemically separated from the urine . Examination of the feces may be required when the predominant elimination is by feces . Special tests for ...
Página 15
... measurement of radiation transmitted through shields , or in other cases where it is necessary to evaluate the potential radiation exposure . When properly designed , the response of these chambers is independent of the wavelength of ...
... measurement of radiation transmitted through shields , or in other cases where it is necessary to evaluate the potential radiation exposure . When properly designed , the response of these chambers is independent of the wavelength of ...
Página 17
... measurements . Combines many of the advan- tages of the C. P. , Zeuto , and Zeus . Rugged and reliable general pur- pose instrument . Not entirely free from wavelength depend- ence , but this is not a critical defect . High sensitivity ...
... measurements . Combines many of the advan- tages of the C. P. , Zeuto , and Zeus . Rugged and reliable general pur- pose instrument . Not entirely free from wavelength depend- ence , but this is not a critical defect . High sensitivity ...
Página 18
... measured on standard laboratory counting equipment . Complications are introduced when the half- life of the collected material is short or comparable with the collection time . The electrostatic precipitation method per- mits the ...
... measured on standard laboratory counting equipment . Complications are introduced when the half- life of the collected material is short or comparable with the collection time . The electrostatic precipitation method per- mits the ...
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
Pasajes populares
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...