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Cosmic-ray heavy-nucleus enders at various atmospheric depths

« Эндерсы » тяжелых ядер в космических лучах при раэличных толшинах атмосферы

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Il Nuovo Cimento B (1965-1970)

Summary

The increased ionization of a heavy cosmic-ray nucleus near the end of the range can cause the deposit of radiation dosage as high as several thousand rads along its trajectory. Although the biological significance of such radiation is still not well understood, it is of interest to know the intensity of stopping heavy nuclei at altitudes where supersonic trasports are expected to operate. The flux of enders of chargesZ ⩾ 6 in nuclear emulsions has been obtained for three balloon flights during 1965–1966 at atmospheric depths 3, 38 and 58 g/cm2. It has been found that the flux of enders incident from a particular zenith angle is a function of the path length from the top of the atmosphere. The number of heavy-nucleus enders encountered at the supersonic transport flight level of (60 000 ÷ 70 000) feet is calculated to be only a few percent of the number that would be encountered on top of the atmosphere for the same duration.

Riassunto

L’aumento della ionizzazione di un nucleo pesante dei raggi cosmici presso la fine della traiettoria può causare il deposito di una dose di radiazione di molte migliaia di unità di radiazione lungo la sua traiettoria. Sebbene non si sia ancora capito il significato biologico di tale radiazione, è interessante conoscere l’intensità dei nuclei pesanti che si arrestano ad altezze a cui si prevede che opereranno i trasporti supersonici. Si è ottenuto il flusso dei nuclei a fine traiettoria di caricaZ ⩾ 6 nelle emulsioni nucleari grazie a tre voli con palloni nel periodo 1965–1966 a profondità atmosferiche di 3, 38 e 58 g/cm2. Si è trovato che il flusso dei nuclei a fine traiettoria incidenti con un particolare angolo zenitale è funzione della lunghezza della traiettoria a partire dalla parte superiore dell’atmosfera. Si calcola che il numero di nuclei pesanti a fine traiettoria incontrati al livello, proprio dei voli di trasporto supersonici, di (60 000 ÷ 70 000) piedi sia solo qualche percento del numero che si incontrerebbe nella parte superiore dell’atmosfera durante lo stesso tempo.

Реэюме

Увеличенная иониэация тяжелых ядер в космических лучах вблиэи конца области может выэывать отложение радиации до нескольких тысяч рад вдоль траектории. Хотя биологическое эначение такой радиации еше недостаточно понятно, однако интересно энать интенсивность останавливаюшихся тяжелых ядер при высотах, где, предполагается, происходит сверхэвуковой перенос. В 1965–1966 г.г. при полетах трех баллонов был иэмерен поток « зндерсов » с эарядамиZ⩾6 в ядерных змульсиях при толшинах атмосферы 3, 38 и 58 г/см2. Было обнаружено, что поток « зндерсов », падаюший иэ определенного эенитного угла, представляет функцию пройденной длины от потолка атмосферы. Вычисляется число « зндерсов » тяжелых ядер, встречаюшихся на уровне полета сверхэвукового переноса,1 (60 000 ÷ 70000) футов, зто число составляет только несколько процентов от числа « зндерсов », которые встретились бы на потолке атмосферы при той же длительности наблюдения.

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The work at Emmanuel College was sponsored in part by AFCRL contract AF 19(628)-3828, and the work at Mississippi State University was sponsored by NASA contract NA 1-7389.

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Fukui, K., Lim, Y.K. & Young, P.J. Cosmic-ray heavy-nucleus enders at various atmospheric depths. Nuovo Cimento B (1965-1970) 61, 210–219 (1969). https://doi.org/10.1007/BF02710929

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  • DOI: https://doi.org/10.1007/BF02710929

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