An Investigation of Radium Luminous Compound

Paterson, C.C.; Walsh, J W T; Higgins, W F

doi:10.1088/1478-7814/29/1/320

Cited by 10 publications

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“…Interpolating Whyte's data for the components of the salts (Ra,Ba,S,O) one obtains an effective attenuation coefficient }J. of 0.124 cm-I . From calculations of Paterson, Walsh, and Higgins [59], the correction factor becomes 1/0.9895.…”

Section: Measurement Of Ionization Currentmentioning

confidence: 99%

A determination of the gamma-ray emission of radium

Attix¹,

Ritz²

1957

J. RES. NATL. BUR. STAN.

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,-ray emission of radi um (roentgen s per m illi gram-hour at 1 centimeter) have been ma de by m eans of a graphite cavity ionization c ha mber. An au xi liary experi mental examination of th e stopping-power correction fo r t he non-air-equi:a lcn ce of.the cavity wall is a lso described . The r esult ing average valu e fot' t he -y-ray emlSSlOn of radIUm (enc losed in an 0.5-millimet er platinum capsule) is 8.26 ± 0.05 roentgen s p er mi ll igra m-hollr at 1 centime ter, whi ch is based upon the concluslOnt.hat the stoppmg-power data of Bakkcr and SegJ'c are con sistent with t he res ults of the a uxliJary expenment.

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Section: Measurement Of Ionization Currentmentioning

confidence: 99%

A determination of the gamma-ray emission of radium

Attix¹,

Ritz²

1957

J. RES. NATL. BUR. STAN.

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“…When the value of the electronic absorption coefficient is known it is possible to calculate the salt correction. According to Paterson et al(8) the salt absorption for a cylindrical source can be calculated as:…”

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confidence: 99%

Absorption Corrections for Radium Standardization

Keyser¹

1951

Can. J. Phys.

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The absorption corrections necessary far radium standardization have been redetermined. The measuring equipment and technique have been investigated to find the conditions necessary far minimum error. A lead filtered, aluminurn walled chamber was found to have the best characteristics. The electronic absorption coefficients measured with this chamber fit a n empirical formula depending only on the atomic number. This formula gives a value for the abssrpt i~n coefficient of radium salts which was compared with a direct experimental value. In troductionThe figure given for radium content of medical or industrial preparations is the result of an intercornparison of gamma-ray intensities with a standard of known content. The intensities are compared using an ionization chamber and an electroscope or other current detecting device. A description of the equipment and technique in use a t various national laboratories has been given by: Oddie (6) for Australia, Curtiss (I) for the United States, Perry (9) for England, and Laurence (4) for Canada.

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Durchgang von α-Strahlen durch Materie

Geiger

1933

Negative Und Positive Strahlen

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An Investigation of Radium Luminous Compound

Abstract: * " The Theory of Decay in Radiosctive Luminous Compounds," J. W. T b Walsh; * A very similw appxratuhwcwi dcucrilxd by Xr. Bluk t o the Illuminatiiiy Engineering gooiuty, March, 1917.

Cited by 10 publications

References 0 publications

A determination of the gamma-ray emission of radium

A determination of the gamma-ray emission of radium

Absorption Corrections for Radium Standardization

Durchgang von α-Strahlen durch Materie

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