0){\n\nif (displayAlpha){\nhintA = \"Alpha particles are the least penetrating and can be stopped by a sheet of paper\"\n}\nelse {\n hintA = \"\"\n }\n \n if (displayBeta){\nhintB = \"Beta particles are more penetrating and can penetrate paper but not Aluminium\"\n}\nelse {\n hintB = \"\"\n }\n\n if (displayGamma){\n//displayGamma?\"Gamma rays are the most penetrating and can penetrate several centimeters of lead\":\"\"\nhintC = \"Gamma rays are the most penetrating and can penetrate several centimeters of lead\"\n}\nelse {\n hintC = \"\"\n }\nhint = hintA +\"\\n\"+ hintB +\"\\n\"+ hintC\n}\n"
}
]
},
"custom": {
"pages": [
{
"Name": "fullscreen",
"Active": "true",
"Internal": "false",
"Type": "LIBRARY_EDITOR",
"Comment": "",
"Code": "//https://developer.mozilla.org/en-US/docs/Web/Guide/API/DOM/Using_full_screen_mode\n// does not work for iOS \n/*jslint browser:true */\nfunction toggleFullScreen() {\n if (!document.fullscreenElement && // alternative standard method\n !document.mozFullScreenElement && !document.webkitFullscreenElement && !document.msFullscreenElement ) { // current working methods\n if (document.documentElement.requestFullscreen) {\n document.documentElement.requestFullscreen();\n } else if (document.documentElement.msRequestFullscreen) {\n document.documentElement.msRequestFullscreen();\n } else if (document.documentElement.mozRequestFullScreen) {\n document.documentElement.mozRequestFullScreen();\n } else if (document.documentElement.webkitRequestFullscreen) {\n document.documentElement.webkitRequestFullscreen();\n }\n } else {\n if (document.exitFullscreen) {\n document.exitFullscreen();\n } else if (document.msExitFullscreen) {\n document.msExitFullscreen();\n } else if (document.mozCancelFullScreen) {\n document.mozCancelFullScreen();\n } else if (document.webkitExitFullscreen) {\n document.webkitExitFullscreen();\n }\n }\n}"
},
{
"Name": "changeOrientation",
"Active": "true",
"Internal": "false",
"Type": "LIBRARY_EDITOR",
"Comment": "",
"Code": "// code to be copied to EJSS source code under Custom and used in drawingPanel3D and plottingPanel2D\n// address the problem is height difference is iOS app , epub, and Firefox\n// user need to change only k and kepub\n// copy %changeOrientation()% into the Height Field of drawingPanel3D and plottingPanel2D\nfunction changeOrientation() {\n \nvar k =0.90 ; // k control height 1 is for full screen, 0.9 shorten etc\nvar kapple =0.90 // control apple app height\nvar kepub =0.90 ;\n// check platform for Apps\ntry { // allow code to run in Student Learning Space \n var iOSapp = (typeof parent.device != 'undefined' && parent.device.platform == \"iOS\");\n var Androidapp = (typeof parent.device != 'undefined' && parent.device.platform == \"Android\");\n} catch(e) {\n var iOSapp = false;\n var Androidapp = false;\n}\n// check platform for web browsers\nvar iOS =/iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;\nvar iPad =/iPad/.test(navigator.userAgent) && !window.MSStream;\nvar iPhone = /iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;\nvar Android= /Android|android/i.test(navigator.userAgent);\n\n//navigator\nvar Firefox = navigator.userAgent.indexOf(\"Firefox\") != -1;\n \nswitch (window.orientation) { // using window.orientation as deciding factor\n case 0:\n case 180:\n this.screenOrientation = 'portrait';\n if (iOSapp){ // does not seems to work\n \n return window.screen.height*kapple; //0.1 for app and 0.1 for nonfullscreenapp \n \n }\n else if (_isEPub){ // does not seems to work\n // return Math.max(window.screen.width,window.screen.height)*0.9;\n return window.innerHeight*kepub; //0.1 for app and 0.1 for nonfullscreenapp \n // return window.screen.height;\n // return window.innerHeight;\n // return document.documentElement.clientHeight;\n }\n \n else {\n \n return 100*k+\"vh\";\n }\n break;\n case 90:\n case -90:\n this.screenOrientation = 'landscape';\n \n if (iOSapp){ // App\n return window.screen.width*kapple; \n // return window.screen.height;\n // return window.innerHeight;\n // return document.documentElement.clientHeight;\n }\n else if (_isEPub){ // does not seems to work\n // return Math.max(window.screen.width,window.screen.height)*0.9;\n return window.innerHeight*kepub; //0.1 for app and 0.1 for nonfullscreenapp \n // return window.screen.height;\n // return window.innerHeight;\n // return document.documentElement.clientHeight;\n }\n \n else {\n return 100*k+\"vh\";\n }\n break;\n default:\n this.screenOrientation = 'unknown';\n // return (iPad)?\"\"+(window.screen.width+window.screen.height)*0.4:((iPhone)?\"\"+window.screen.width:_view._format(window.innerHeight*0.9,\"0\"));\n if (Firefox){\n return window.innerHeight*k;// number as of 20180831 Firefox does not support vh yet so need a separate line to handle\n }\n // else if (iOS&&(window.orientation==0)||(window.orientation==180)){\n // return window.screen.height*k;// number as of 20180831 Firefox does not support vh yet so need a separate line to handle\n // }\n // else if (iOS&&(window.orientation==90)||(window.orientation==-90)){\n // return window.screen.width*k;// number as of 20180831 Firefox does not support vh yet so need a separate line to handle\n // }\n else {\n //alert();\n // return 100*k+\"%\"; // work on fullscreen works in EJSS6.0beta\n // works in EjsS_5.3_180131\n return window.innerHeight*k; // work on panel \n \n}\n\n}\n \n}"
},
{
"Name": "speech",
"Active": "true",
"Internal": "false",
"Type": "LIBRARY_EDITOR",
"Comment": "",
"Code": "// copy this custom function\n// in iOS need to add speech to the play button as On iOS the API works but must be triggered by a user action callback, like a response to a tap event, to provide a better experience to users and avoid unexpected sounds out of your phone\nfunction speech (option) {\n\n\ntry { // allow code to run in Student Learning Space \nvar isCordova = (!!this.parent.cordova || !!window.cordova);\nif(isCordova) { // check it is running in Android or iOS\n // parent.TTS.speak({text:option,locale:'zh-CN'});\n\tparent.TTS.speak({text:option,locale:'us-EN'});\n\t// parent.TTS.speak({text:option,locale:'en-US'});\n\t// parent.TTS.speak({text:option,locale:'id-ID'});\n} \n} \ncatch(e) {\n var isCordova = false;\n }\n \n var msg = new SpeechSynthesisUtterance(option);\n\n //https://stackoverflow.com/questions/43983845/speechsynthesis-api-for-chinese-firefox\n // Set the text.\n\t//msg.text = option; \n\t//https://forums.developer.apple.com/message/323564#323564\n\t// comment out the next 2 lines for english\n//msg.voice = speechSynthesis.getVoices().filter(function(voice) { return voice.name == 'Ting-Ting'; })[0];\n//msg.lang = 'zh-CH'; // need for android?\n//msg.lang = 'id-ID'; // need for android?\nmsg.lang = 'us-EN'; // need for android?\n\n//https://flaviocopes.com/speech-synthesis-api/\n//debug\n//console.log(`Voices #: ${speechSynthesis.getVoices().length}`)\n//speechSynthesis.getVoices().forEach(voice => {\n// console.log(voice.name, voice.lang)\n//})\n//debug\n\n// Queue this utterance.\nwindow.speechSynthesis.speak(msg);\n\n\n\n \n\n}"
},
{
"Name": "visible",
"Active": "true",
"Internal": "false",
"Type": "LIBRARY_EDITOR",
"Comment": "",
"Code": "//function visibleAlpha () {\n //if !(displayAlpha) {\n //return false;\n //}\n //if (displayPaper) {\n //return alphaX < paperX + length/2;\n //}\n //else if (displayAl) {\n //return alphaX < alX + length/2;\n //}\n //else if (displayPb) {\n //return alphaX < pbX + length/2;\n //}\n//}\n \n\n"
}
]
},
"elements": {
"list": []
}
},
"view": {
"Tree": [
{
"Name": "fullscreen",
"Type": "Panel",
"Expanded": "true",
"Properties": [
{
"name": "Width",
"value": "Width"
}
],
"Children": [
{
"Name": "control",
"Type": "Panel",
"Expanded": "false",
"Properties": [
{
"name": "BorderWidth",
"value": "1"
}
],
"Children": [
{
"Name": "controlPanel",
"Type": "Panel",
"Expanded": "false",
"Properties": [
{
"name": "Font",
"value": "font"
}
],
"Children": [
{
"Name": "checkBoxAlpha",
"Type": "CheckBox",
"Properties": [
{
"name": "OnCheckOff",
"value": "displayAlpha=false;"
},
{
"name": "Checked",
"value": "displayAlpha"
},
{
"name": "Tooltip",
"value": "\"Alpha particles are the least penetrating and can be stopped by a sheet of paper\""
},
{
"name": "Text",
"value": "\"\u03b1 Alpha\""
},
{
"name": "OnCheckOn",
"value": "displayAlpha=true;"
},
{
"name": "Display",
"value": "\"inline-block\""
}
]
},
{
"Name": "checkBoxBeta",
"Type": "CheckBox",
"Properties": [
{
"name": "OnCheckOff",
"value": "displayBeta=false;"
},
{
"name": "Checked",
"value": "displayBeta"
},
{
"name": "Background",
"value": "\"Magenta\""
},
{
"name": "Tooltip",
"value": "\"Beta particles are more penetrating and can penetrate paper but not Aluminium\""
},
{
"name": "Text",
"value": "\"\u03b2 Beta\""
},
{
"name": "OnCheckOn",
"value": "displayBeta=true;"
},
{
"name": "Display",
"value": "\"inline-block\""
}
]
},
{
"Name": "checkBoxGamma",
"Type": "CheckBox",
"Properties": [
{
"name": "OnCheckOff",
"value": "displayGamma=false;\n"
},
{
"name": "Checked",
"value": "displayGamma"
},
{
"name": "Background",
"value": "\"Red\""
},
{
"name": "Tooltip",
"value": "\"Gamma rays are the most penetrating and can penetrate several centimeters of lead\""
},
{
"name": "Text",
"value": "\"\u03b3 Gamma\""
},
{
"name": "OnCheckOn",
"value": "displayGamma=true;"
},
{
"name": "Display",
"value": "\"inline-block\""
}
]
},
{
"Name": "paper2",
"Type": "Panel",
"Expanded": "true",
"Properties": [
{
"name": "Background",
"value": "\"White\""
},
{
"name": "Display",
"value": "\"inline-block\""
}
],
"Children": [
{
"Name": "checkBoxPaper",
"Type": "CheckBox",
"Properties": [
{
"name": "OnCheckOff",
"value": "displayPaper=false;"
},
{
"name": "Checked",
"value": "true"
},
{
"name": "Background",
"value": "\"White\""
},
{
"name": "Text",
"value": "\"Paper\""
},
{
"name": "OnCheckOn",
"value": "displayPaper=true;"
},
{
"name": "Display",
"value": "\"inline-block\""
}
]
},
{
"Name": "sliderPaper",
"Type": "Slider",
"Properties": [
{
"name": "Minimum",
"value": "0.1"
},
{
"name": "Maximum",
"value": "3"
},
{
"name": "Background",
"value": "\"White\""
},
{
"name": "Value",
"value": "paperthick"
},
{
"name": "Step",
"value": "0.1"
}
]
}
]
},
{
"Name": "AL",
"Type": "Panel",
"Expanded": "true",
"Properties": [
{
"name": "Background",
"value": "\"LightGray\""
},
{
"name": "Display",
"value": "\"inline-block\""
}
],
"Children": [
{
"Name": "checkBoxaAl",
"Type": "CheckBox",
"Properties": [
{
"name": "Checked",
"value": "true"
},
{
"name": "OnCheckOff",
"value": "displayAl=false;"
},
{
"name": "Background",
"value": "\"LightGray\""
},
{
"name": "Text",
"value": "\"Aluminium\""
},
{
"name": "OnCheckOn",
"value": "displayAl=true;"
},
{
"name": "Display",
"value": "\"inline-block\""
}
]
},
{
"Name": "sliderAl",
"Type": "Slider",
"Properties": [
{
"name": "Minimum",
"value": "0.1"
},
{
"name": "Maximum",
"value": "3"
},
{
"name": "Background",
"value": "\"LightGray\""
},
{
"name": "Value",
"value": "althick"
},
{
"name": "Step",
"value": "0.1"
}
]
}
]
},
{
"Name": "Pb",
"Type": "Panel",
"Expanded": "true",
"Properties": [
{
"name": "Background",
"value": "\"DarkGray\""
},
{
"name": "Display",
"value": "\"inline-block\""
}
],
"Children": [
{
"Name": "checkBoxPb",
"Type": "CheckBox",
"Properties": [
{
"name": "Checked",
"value": "true"
},
{
"name": "OnCheckOff",
"value": "displayPb=false;"
},
{
"name": "Background",
"value": "\"DarkGray\""
},
{
"name": "Text",
"value": "\"Lead\""
},
{
"name": "OnCheckOn",
"value": "displayPb=true;"
},
{
"name": "Display",
"value": "\"inline-block\""
}
]
},
{
"Name": "sliderPb",
"Type": "Slider",
"Properties": [
{
"name": "Minimum",
"value": "1"
},
{
"name": "Maximum",
"value": "5"
},
{
"name": "Background",
"value": "\"DarkGray\""
},
{
"name": "Value",
"value": "pbthick"
},
{
"name": "Step",
"value": "0.1"
}
]
}
]
},
{
"Name": "playPauseButton2",
"Type": "TwoStateButton",
"Properties": [
{
"name": "OffClick",
"value": "_pause();\n//speech (\"paused\");"
},
{
"name": "TextOn",
"value": "\"Play\u25b6\""
},
{
"name": "State",
"value": "_isPaused"
},
{
"name": "Tooltip",
"value": "\"Play/Pause\""
},
{
"name": "TextOff",
"value": "\"Pause\u275a\u275a\""
},
{
"name": "OnClick",
"value": "_play();\n//speech (\"play\");"
},
{
"name": "Font",
"value": "font"
}
]
},
{
"Name": "stepButton2",
"Type": "Button",
"Properties": [
{
"name": "Text",
"value": "\"Step|\u25ba\""
},
{
"name": "OnClick",
"value": "_step()"
},
{
"name": "Font",
"value": "font"
}
]
},
{
"Name": "resetButton3",
"Type": "Button",
"Properties": [
{
"name": "Text",
"value": "\"Reset\u21bb\""
},
{
"name": "OnClick",
"value": "_reset();\n//speechzh (\"\u4f60\u597d\");\n"
},
{
"name": "Font",
"value": "font"
}
]
}
]
}
]
},
{
"Name": "panel",
"Type": "Panel",
"Expanded": "false",
"Properties": [
{
"name": "Height",
"value": "\"100%\""
},
{
"name": "Width",
"value": "\"100%\""
}
],
"Children": [
{
"Name": "plottingPanel",
"Type": "PlottingPanel",
"Expanded": "true",
"Properties": [
{
"name": "Gutters",
"value": "[0,0,0,0]"
},
{
"name": "ShowAreaRectangle",
"value": "false"
},
{
"name": "YScalePrecision",
"value": "0"
},
{
"name": "XFixedTick",
"value": "-1"
},
{
"name": "OnDoubleClick",
"value": "toggleFullScreen();"
},
{
"name": "YFixedTick",
"value": "0"
},
{
"name": "XTickStep",
"value": "10"
},
{
"name": "YTickStep",
"value": "3"
},
{
"name": "XAutoTicks",
"value": "false"
},
{
"name": "Height",
"value": "%changeOrientation()%"
},
{
"name": "OnPress",
"value": "var position = _view.plottingPanel.getInteraction().getInteractionPoint();\n"
},
{
"name": "Width",
"value": "Width1"
},
{
"name": "TLMessage",
"value": "%hint%"
},
{
"name": "Enabled",
"value": "true"
},
{
"name": "SquareAspect",
"value": "true"
},
{
"name": "MaximumY",
"value": "9"
},
{
"name": "MaximumX",
"value": "10"
},
{
"name": "EnabledDragging",
"value": "\"ENABLED_X\""
},
{
"name": "YAutoTicks",
"value": "false"
},
{
"name": "MinimumX",
"value": "-10"
},
{
"name": "MinimumY",
"value": "-9"
},
{
"name": "AutoScaleY",
"value": "false"
},
{
"name": "AutoScaleX",
"value": "false"
},
{
"name": "Visibility",
"value": "world===true"
},
{
"name": "XScalePrecision",
"value": "0"
},
{
"name": "BRMessage",
"value": "\" t = \"+_view._format(t,\"0.00\")+ \" s \""
}
],
"Children": [
{
"Name": "paper",
"Type": "Polygon2D",
"Properties": [
{
"name": "Points",
"value": "[[paperX,paperY],[paperX+length,paperY-1],[paperX+length,paperY-1-height],[paperX,paperY-height],[paperX,paperY],[paperX+paperthick,paperY],[paperX+paperthick+length,paperY-1],[paperX+paperthick+length,paperY-height-1],[paperX+length,paperY-height-1]]"
},
{
"name": "FillColor",
"value": "\"White\""
},
{
"name": "LineColor",
"value": "\"Blue\""
},
{
"name": "Visibility",
"value": "displayPaper"
}
]
},
{
"Name": "paperline_needtodraw_toavoid_the_ploygon",
"Type": "Segment2D",
"Properties": [
{
"name": "SizeX",
"value": "-paperthick"
},
{
"name": "Position",
"value": "[paperX+paperthick+length,paperY-1]"
},
{
"name": "LineColor",
"value": "\"Blue\""
},
{
"name": "Visibility",
"value": "displayPaper"
},
{
"name": "SizeY",
"value": "0"
},
{
"name": "Offset",
"value": "\"SOUTH_WEST\""
}
]
},
{
"Name": "aluminium",
"Type": "Polygon2D",
"Properties": [
{
"name": "Points",
"value": "[[alX,alY],[alX+length,alY-1],[alX+length,alY-1-height],[alX,alY-height],[alX,alY],[alX+althick,alY],[alX+althick+length,alY-1],[alX+althick+length,alY-height-1],[alX+length,alY-height-1]]"
},
{
"name": "FillColor",
"value": "\"LightGray\""
},
{
"name": "Visibility",
"value": "displayAl"
}
]
},
{
"Name": "alline_needtodraw_toavoid_the_ploygon",
"Type": "Segment2D",
"Properties": [
{
"name": "SizeX",
"value": "-althick"
},
{
"name": "Position",
"value": "[alX+althick+length,alY-1]"
},
{
"name": "Visibility",
"value": "displayAl"
},
{
"name": "SizeY",
"value": "0"
},
{
"name": "Offset",
"value": "\"SOUTH_WEST\""
}
]
},
{
"Name": "debugging",
"Type": "Group2D",
"Expanded": "true",
"Properties": [
{
"name": "Visibility",
"value": "false"
}
],
"Children": [
{
"Name": "shape3",
"Type": "Shape2D",
"Properties": [
{
"name": "SizeX",
"value": "5"
},
{
"name": "X",
"value": "alX+length/2"
},
{
"name": "SizeY",
"value": "5"
},
{
"name": "PixelSize",
"value": "true"
}
]
}
]
},
{
"Name": "Pbdebug",
"Type": "Group2D",
"Expanded": "true",
"Properties": [
{
"name": "Visibility",
"value": "false"
}
],
"Children": [
{
"Name": "shape2",
"Type": "Shape2D",
"Properties": [
{
"name": "SizeX",
"value": "5"
},
{
"name": "X",
"value": "pbX+length/2"
},
{
"name": "SizeY",
"value": "5"
},
{
"name": "PixelSize",
"value": "true"
}
]
}
]
},
{
"Name": "lead",
"Type": "Polygon2D",
"Properties": [
{
"name": "Points",
"value": "[[pbX,pbY],[pbX+length,pbY-1],[pbX+length,pbY-1-height],[pbX,pbY-height],[pbX,pbY],[pbX+pbthick,pbY],[pbX+pbthick+length,pbY-1],[pbX+pbthick+length,pbY-height-1],[pbX+length,pbY-height-1]]"
},
{
"name": "FillColor",
"value": "\"Gray\""
},
{
"name": "Visibility",
"value": "displayPb"
}
]
},
{
"Name": "leadline_needtodraw_toavoid_the_ploygon",
"Type": "Segment2D",
"Properties": [
{
"name": "SizeX",
"value": "-pbthick"
},
{
"name": "Position",
"value": "[pbX+pbthick+length,pbY-1]"
},
{
"name": "Visibility",
"value": "displayPb"
},
{
"name": "SizeY",
"value": "0"
},
{
"name": "Offset",
"value": "\"SOUTH_WEST\""
}
]
},
{
"Name": "alpha",
"Type": "Group2D",
"Expanded": "true",
"Properties": [
{
"name": "PixelPosition",
"value": "true"
},
{
"name": "Visibility",
"value": "displayAlpha"
}
],
"Children": [
{
"Name": "proton1",
"Type": "Shape2D",
"Properties": [
{
"name": "FillColor",
"value": "\"Green\""
},
{
"name": "SizeX",
"value": "ra"
},
{
"name": "ShapeType",
"value": "\"ELLIPSE\""
},
{
"name": "X",
"value": "alphaX-dx"
},
{
"name": "Y",
"value": "alphaY"
},
{
"name": "SizeY",
"value": "ra"
}
]
},
{
"Name": "text",
"Type": "Text2D",
"Properties": [
{
"name": "X",
"value": "alphaX-dx"
},
{
"name": "Y",
"value": "alphaY"
},
{
"name": "Text",
"value": "\"+\""
}
]
},
{
"Name": "neutron1",
"Type": "Shape2D",
"Properties": [
{
"name": "FillColor",
"value": "\"Cyan\""
},
{
"name": "SizeX",
"value": "ra"
},
{
"name": "ShapeType",
"value": "\"ELLIPSE\""
},
{
"name": "X",
"value": "alphaX-dx"
},
{
"name": "Y",
"value": "alphaY+dy"
},
{
"name": "SizeY",
"value": "ra"
}
]
},
{
"Name": "proton2",
"Type": "Shape2D",
"Properties": [
{
"name": "FillColor",
"value": "\"Green\""
},
{
"name": "SizeX",
"value": "ra"
},
{
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"value": "Penetrating Abilities of Radioactive Emissions Simulation \n Video Explanation \n You can watch a video explanation here:
\n\n VIDEO \n\n \n Or open it directly on YouTube: \n \n https://www.youtube.com/watch?v=3t4b-inELNg\n \n
\n \n Radioactive emissions are a type of energy that is emitted by certain unstable isotopes of elements. \n These emissions can be harmful to living organisms and can penetrate different materials to varying degrees. \n Studying the penetrating abilities of these emissions is important in understanding their potential effects \n on human health and the environment.\n
\n\n \n One way to study the penetrating abilities of radioactive emissions is through simulation. \n A simulation is a computer program that models a real-world scenario, allowing scientists to explore the \n effects of different variables in a controlled environment. In this blog, we will explore a simulation that \n focuses on the penetrating abilities of radioactive emissions.\n
\n\n \n The simulation begins with 3 sources of radioactive emissions that emit particles in all directions. \n For simplicity, we will only look at the one direction to the right of the screen. The user can turn on/off \n the type of particle being emitted, such as alpha, beta, or gamma particles. The simulation then shows how \n these particles interact with different materials, such as paper, aluminium or lead.\n
\n\n \n One of the key features of the simulation is the ability to adjust the thickness of the materials being used. \n This allows the user to see how different materials affect the ability of the particles to penetrate through them. \n For example, gamma particles are highly penetrating and can travel through thick layers of material, while alpha \n particles are less penetrating and can be stopped by a sheet of paper.\n
\n\n \n Another important feature of the simulation is the ability to view the particles in different situations \n (with/without paper, aluminium or lead.) The user can choose to view the particles as they move through the \n materials, or as they interact with atoms in the material. This allows for a deeper understanding of the \n mechanisms by which the particles interact with matter.\n
\n\n \n The simulation also includes a visualization that allows the user to see the amount of radiation absorbed by a material.\n
\n\n \n Overall, the penetrating abilities of radioactive emissions simulation is a powerful tool for exploring the effects \n of radioactive emissions on the environment and human health. By allowing users to adjust the variables and observe \n the results in real-time, the simulation provides a flexible and interactive way to study this important topic.\n
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